
What Is Original Resin Used For?
Original Resin is mainly used to claim rewards from progression content. The most common Resin activities include Ley Line Outcrops, Domains, Normal Bosses, Weekly Bosses, and some special crafting options.
Domains use Original Resin at the Petrified Tree after completion, and different domain types reward different materials. Domain of Blessing rewards artifacts, Domain of Mastery rewards talent level-up materials, and Domain of Forgery rewards weapon ascension materials.
Ley Line Outcrops are used for Mora and character EXP materials. Normal Bosses are used for character ascension materials. Weekly Bosses, also called Trounce Domains or Trounce Blossoms depending on the content, are used for weekly talent materials, gemstones, billets, artifacts, and other rewards.
The important idea is that Resin should become your daily account-building resource. Every Resin decision should help answer one of these questions:
Does this make my main character stronger?
Does this help a support my team needs?
Does this unlock an ascension?
Does this upgrade a weapon?
Does this improve an important talent?
Does this fix a Mora or EXP shortage?
Does this prepare a character I am building soon?
Does this improve my artifacts at the right account stage?
If the answer is no, that Resin may be better spent somewhere else.
Why Resin Efficiency Matters
Resin is limited by time. You cannot farm unlimited boss drops, talent books, weapon materials, or artifacts in one day without using extra Resin items or Primogems. Because Resin regenerates slowly, bad spending habits can delay your account for days or weeks.
For example, farming artifacts too early can feel exciting, but if your weapon is underleveled and talents are ignored, the account may still feel weak. Farming random bosses can fill your inventory with materials you do not need, while the character you actually use remains stuck. Farming Ley Lines when you already have enough Mora and EXP books may slow down character ascension or talent upgrades.
Good Resin use gives visible progress. Bad Resin use creates inventory clutter.
Efficient Resin planning is especially important for free-to-play players. F2P players usually do not spend Primogems on Resin refreshes, so their daily Resin is the main farming limit. If that Resin is used badly, progress slows. If it is used well, even a free-to-play account can become very strong.
BoostRoom helps players avoid the biggest Resin mistake: farming what feels urgent instead of farming what actually improves the account.
The Current Original Resin Cap and Recharge Rate
Original Resin currently caps at 200 and regenerates at 1 Resin every 8 minutes. Since 24 hours contains 1,440 minutes, this means players naturally regenerate 180 Resin per day if they keep Resin below the cap. The 200 cap gives extra breathing room because it takes more than one full day to reach the cap from zero.
This matters for daily scheduling. You do not need to log in every few hours to avoid waste. However, if you ignore Resin for more than 26 hours and 40 minutes from zero, it will reach the cap and stop regenerating. Once Resin is capped, every minute spent capped is lost potential Resin.
A simple habit is to spend Resin once per day. If you cannot play much, turn it into Condensed Resin or spend it quickly on a boss, Ley Line, or domain. Even a short Resin session is better than leaving it capped for days.
Original Resin Costs by Activity
Different activities cost different amounts of Resin.
Ley Line Outcrops cost 20 Original Resin to claim rewards.
Many domains cost 20 Original Resin to claim rewards.
Normal Bosses cost 40 Original Resin to claim rewards.
Weekly Bosses cost 30 Resin for the first three weekly reward claims, then 60 Resin after that.
Forging Mystic Enhancement Ore with Magical Crystal Chunks can use 10 Original Resin.
Game8’s Resin guide lists Ley Lines and domains at 20 Resin, Trounce Domains at 30 Resin for the first three weekly uses, Elite Bosses at 40 Resin, and Mystic Enhancement Ore forging at 10 Resin.
These costs help you plan your daily Resin. With 180 natural Resin per day, you can do combinations such as several domains, multiple bosses, a mix of Ley Lines and bosses, or weekly boss claims plus other farming.
Do not think only in daily Resin. Think in weekly Resin. A player regenerates 1,260 Resin per week if they avoid capping, which is enough to make meaningful progress if planned well.
Condensed Resin Explained
Condensed Resin is a crafted item that stores Original Resin for later use. As of Version “Luna I,” Condensed Resin requires 60 Original Resin to craft and can be used to receive 3 sets of rewards at one time from Ley Line Blossoms or Petrified Trees in Domains. Players can hold up to 5 Condensed Resin at once.
Condensed Resin is mainly a time-saving tool. Instead of running a domain three times with Original Resin, you can use one Condensed Resin to claim three reward sets at once. This does not make the rewards better per Resin; it makes farming faster and helps store Resin when you cannot farm right away.
Condensed Resin can be used for:
Artifact domains.
Talent material domains.
Weapon material domains.
Ley Line Outcrops.
Condensed Resin cannot be used for Normal Bosses or Weekly Bosses, and it usually cannot be used for Resin-costing events unless the event specifically allows it.
This means Condensed Resin is excellent when you want to save time on domains or Ley Lines, but it does not replace Original Resin for boss farming.
When Should You Craft Condensed Resin?
Craft Condensed Resin when you do not have time to farm, when the domain you need is not available that day, or when you want to speed up repetitive farming.
For example, if your talent material domain is available tomorrow, but your Resin is close to cap today, you can condense Resin and save it for tomorrow. If you only have a few minutes to log in, you can craft Condensed Resin instead of forcing a farming session. If you are farming artifacts, Condensed Resin reduces the number of domain runs needed.
Condensed Resin is best for:
Busy days.
Artifact farming sessions.
Talent material farming.
Weapon material farming.
Mora Ley Lines.
EXP Ley Lines.
Saving Resin for a specific domain day.
Condensed Resin is not best for:
Normal Boss farming.
Weekly Boss farming.
Situations where you need to spend Original Resin directly.
Players trying to complete certain counters that require claiming Ley Line rewards one at a time.
The main advantage is convenience. If Resin is close to cap and you cannot farm properly, Condensed Resin protects your Resin value.
Fragile Resin Explained
Fragile Resin is a consumable item that restores 60 Original Resin. It is usually earned from Adventure Rank rewards, Battle Pass rewards, events, and other sources. It is valuable because it lets you farm more than your natural daily Resin.
The most important rule is not to spend Fragile Resin randomly. Fragile Resin is limited, while Original Resin regenerates. Spending Fragile Resin too early can feel good for a day, but it may reduce your farming power later when rewards are better.
Many players save Fragile Resin until Adventure Rank 45 because high-level artifact domains become more valuable there. That does not mean every Fragile Resin must be saved forever, but beginners should avoid burning all of it before they understand what they need.
Use Fragile Resin when:
You are AR45 or higher and ready for artifact farming.
You are preparing a character and need boss or talent materials.
You need a short farming push for an important upgrade.
You understand exactly what the Resin will be used for.
Avoid using Fragile Resin when:
You are farming random materials.
You are chasing low-level artifacts.
You are bored and want to spend Resin without a plan.
You are trying to rush Adventure Rank but your team is weak.
BoostRoom recommends treating Fragile Resin like a savings account, not daily spending money.
Transient Resin Explained
Transient Resin is another item that restores 60 Original Resin, but unlike Fragile Resin, it expires. It can be bought from the Serenitea Pot Realm Depot with Realm Currency and refreshes weekly. Game8 notes that Transient Resin restores 60 Original Resin and expires after a limited period.
Because Transient Resin expires, it should be used before Fragile Resin. A common mistake is saving Transient Resin too long and losing it. If you buy it, make a plan to spend it.
Good uses for Transient Resin include:
Weekly Boss claims.
Character ascension bosses.
Talent books.
Weapon materials.
Artifact farming.
Ley Lines if Mora or EXP books are low.
The rule is simple: use expiring Resin before permanent Resin.
Should You Spend Primogems on Resin Refreshes?
Most players should avoid spending Primogems on Resin refreshes. Primogems can be used to replenish 60 Original Resin, with the cost increasing from 50 to 200 Primogems depending on the daily refresh number. They can also be used to buy Fates for Wishes, with each Fate costing 160 Primogems.
For free-to-play and low-spending players, Primogems are usually more valuable for limited characters than for extra farming. Resin comes back naturally. Primogems take longer to collect and directly affect banner plans.
A Resin refresh can give short-term materials. A saved Fate can help you reach a character you want. For most accounts, characters and important supports create more long-term value than a few extra domain runs.
Resin refreshes may make sense for heavy spenders, content creators, or players racing to build a character immediately. But for normal players, especially beginners, it is better to save Primogems for Wishes.
BoostRoom’s advice is clear: do not use Primogems for Resin unless you fully understand the trade-off and still accept it.
Best Resin Priority for Beginners
Beginners should focus Resin on guaranteed upgrades. Early in the game, artifacts are temporary, and many characters are not ready for perfect builds. The most efficient beginner Resin use is usually character ascension, weapon ascension, talent materials, Mora, and EXP books.
A beginner Resin priority should look like this:
Main damage character ascension.
Main weapon ascension.
Important talent materials.
Healer or shielder upgrades.
Mora or EXP Ley Lines when resources are low.
Boss materials for characters you actively use.
Basic artifacts only when needed.
This keeps the account strong while Adventure Rank rises. If a beginner spends too much Resin on low-level artifact domains, they may end up with pieces that get replaced quickly while weapons and talents remain weak.
The early game is about building a stable team, not chasing perfect stats.
Best Resin Priority Before AR45
Before AR45, Resin should mostly go into things that give guaranteed progress. This includes character levels, ascension materials, weapons, talents, and resources.
Artifacts still matter, but you can use pieces from quests, chests, bosses, and normal gameplay. You can upgrade decent artifacts moderately, especially on your main damage dealer, but heavy artifact farming should usually wait.
Before AR45, a strong plan is:
Farm bosses for ascensions.
Farm weapon materials on the correct days.
Farm talent books for your main team.
Use Ley Lines when Mora or EXP books are low.
Claim Weekly Boss rewards when useful.
Save most Fragile Resin.
Use temporary artifacts with correct main stats.
This plan prevents the most common early mistake: spending too much Resin on artifacts before the best domain reward tiers are available.
Best Resin Priority at AR45 and Later
Adventure Rank 45 is a major point because artifact farming becomes more valuable. High-level artifact domains can provide reliable 5-star artifact drops, which makes serious artifact farming worth considering.
However, even at AR45, artifacts should not be your only Resin use. If your talents are low, your weapon is underleveled, or your character cannot ascend, artifact farming alone will not fix everything.
At AR45 and later, a balanced Resin plan is:
Farm artifacts for your main team.
Keep upgrading important talents.
Ascend main characters.
Finish weapon ascensions.
Claim useful Weekly Boss rewards.
Use Ley Lines if Mora or EXP books run low.
Prepare future characters only after your current team is stable.
Artifacts become important, but guaranteed upgrades still matter. A character with good artifacts but low talents may underperform. A character with high talents and a weak weapon may still feel incomplete.
Best Resin Use for Main DPS Characters
Your main DPS usually deserves the first big Resin investment because they carry much of your team’s damage. A stronger main DPS makes quests, bosses, domains, and events easier.
For a main DPS, Resin should usually go toward:
Character ascension boss materials.
Weapon ascension materials.
Important talent books.
Artifacts after the account reaches the right stage.
Weekly Boss materials for higher talent levels.
Do not start with artifacts if the character is underleveled and their weapon is weak. Weapon and talent upgrades are predictable, while artifacts are random. The best main DPS investment order is usually:
Character ascension.
Weapon level and ascension.
Important talents.
Usable artifacts.
Better artifacts over time.
This order gives steady power instead of gambling all Resin on artifact drops.
Best Resin Use for Supports
Supports are often the best long-term Resin investments because they help multiple teams. Bennett, Xingqiu, Xiangling, Sucrose, Fischl, Kuki Shinobu, Yaoyao, Diona, and many other supports can improve an account more than a second or third main DPS.
Support Resin priorities depend on the character’s role. A Burst support may need talent books and Energy Recharge artifacts. A healer may need character levels, HP or healing stats, and enough talent investment. A shielder may need HP, DEF, or talent levels. A reaction trigger may need character levels and Elemental Mastery.
For supports, Resin should go toward:
Key talent levels.
Ascension when needed.
Weapons that solve energy or support needs.
Artifacts with correct main stats.
Boss materials only for supports you actively use.
Supports do not always need perfect artifacts. Many supports only need enough Energy Recharge and the correct set effect to do their job well.
Best Resin Use for Healers and Shielders
Healers and shielders are comfort investments. They may not look as exciting as damage dealers, but they help players clear harder content consistently.
A healer may need Resin for talent books, ascension materials, and sometimes artifacts. A shielder may need similar investment, especially if their shield scales from talent levels and HP or DEF.
Do not over-invest if the healer or shielder already does their job. Once survival feels comfortable, Resin may be better spent improving damage or support value. But if your team keeps dying, investing Resin into a healer or shielder can be the fastest way to progress.
A team that survives can finish fights. A team that dies wastes time.
Best Resin Use for Reaction Teams
Reaction teams can have different Resin priorities than traditional DPS teams. Hyperbloom, Burgeon, Swirl, Aggravate, Spread, Vaporize, and Melt teams all value different stats.
For Hyperbloom and Burgeon triggers, character level and Elemental Mastery are extremely important. Resin may be better spent leveling the trigger character and farming Elemental Mastery artifacts than chasing CRIT stats.
For Aggravate and Spread teams, you may need a mix of character levels, talents, Elemental Mastery, CRIT stats, and damage bonuses.
For Vaporize and Melt teams, traditional DPS investment often matters: talents, weapons, CRIT, ATK, Elemental Mastery, and elemental damage.
For Swirl supports, character level and Elemental Mastery are important, along with enough Energy Recharge.
The key is to understand the team before spending Resin. A Hyperbloom Kuki Shinobu does not need the same artifacts as a traditional Electro DPS. A Swirl Sucrose does not need the same stats as a CRIT-based Anemo carry.
Ley Lines: When Are They Worth Resin?
Ley Line Outcrops are used to farm Mora and character EXP materials. Some players avoid Ley Lines because they feel less exciting than artifacts or bosses, but Ley Lines are important when your account is low on resources.
A character cannot level up without EXP books. Talents, weapons, artifacts, and many upgrades require Mora. If you are constantly broke, farming more artifacts will not help because you will not have enough Mora to upgrade them.
Use Mora Ley Lines when:
You cannot upgrade talents.
You cannot level weapons.
You cannot enhance artifacts.
You are preparing several characters.
You are below your comfort Mora amount.
Use EXP Ley Lines when:
You need to level a new character.
You are preparing ascensions.
You have no EXP books left.
You are building multiple supports.
Ley Lines are not wasted Resin if they solve a real shortage.
Domains: Talent, Weapon, and Artifact Farming
Domains are one of the most common Resin activities. The three major domain reward types are artifacts, talent materials, and weapon ascension materials. Domains require Original Resin to claim rewards after completion, and each domain type serves a different progression purpose.
Talent domains are important because talents directly increase character abilities. Weapon domains are important because weapons are one of the fastest ways to improve a character. Artifact domains are important later because artifacts shape advanced builds.
The best domain to farm depends on your current bottleneck. If your weapon cannot ascend, farm weapon materials. If your main talent is low, farm talent books. If your character already has good levels, weapons, and talents, farm artifacts.
A smart domain plan avoids farming everything at once. Focus on one character or one team, complete the necessary upgrades, then move to the next priority.
Normal Bosses: When to Farm Them
Normal Bosses cost 40 Original Resin to claim rewards and provide character ascension materials. They are necessary when building characters, but they should be farmed with a plan.
Do not farm bosses randomly. Each boss drops specific materials for specific characters. If no character you use needs that boss material, the Resin may sit in your inventory unused.
Farm Normal Bosses when:
A character you use needs ascension materials.
You are preparing a future character and know the boss materials.
Your main DPS is stuck at an ascension cap.
A support needs ascension for an important passive talent.
Avoid boss farming when:
You do not know who needs the material.
Your current characters already have enough boss drops.
You are farming only because you do not know what else to do.
Boss materials are valuable only when connected to a character plan.
Weekly Bosses: How Many Should You Do?
Weekly Bosses are important because they drop materials needed for higher talent levels. The first three weekly boss reward claims each week cost 30 Resin, while claims after that cost 60 Resin.
For most players, doing the first three discounted Weekly Bosses is a good habit, especially when you need talent materials, billets, Dream Solvent, or other rewards. However, doing every weekly boss at full cost may not always be efficient unless you need specific materials.
A beginner may not need every weekly boss immediately. A mid-game player should start collecting weekly materials for characters they use. An endgame player may target specific bosses based on talents they are leveling.
Good weekly boss planning:
Do discounted weekly claims first.
Prioritize bosses that drop materials your characters need.
Do not spend 60 Resin on extra weekly bosses unless the rewards are useful.
Remember that weekly materials become important for higher talent levels.
Weekly Bosses are long-term investments, but they should still be chosen carefully.
Artifact Farming and Resin Efficiency
Artifacts are the most random Resin activity. They can greatly improve characters, but they can also consume large amounts of Resin without giving the exact piece you want.
This is why artifact farming should be timed carefully. Before AR45, most players should avoid heavy artifact farming. After AR45, artifact farming becomes much more valuable because 5-star artifacts become a core part of character building.
Even after AR45, artifact farming should have limits. Do not spend weeks chasing a perfect piece while talents, weapons, and character ascensions remain unfinished. “Good enough” artifacts can clear most content when the team is built properly.
Efficient artifact farming means:
Farm domains that help multiple characters.
Keep rare main stats.
Use the Artifact Strongbox when useful.
Stop when the build is functional.
Return later for optimization.
Do not expect perfect artifacts quickly.
BoostRoom’s artifact rule: farm for progress, not perfection.
How to Choose What to Farm Each Day
A simple daily Resin decision system can prevent waste.
First, check if any character is blocked by ascension. If yes, farm the needed boss or material.
Second, check weapons. If your main weapon cannot ascend, farm the correct weapon domain.
Third, check talents. If important talents are low, farm talent books on the correct day.
Fourth, check Mora and EXP books. If you cannot afford upgrades, farm Ley Lines.
Fifth, check artifacts. If your guaranteed upgrades are handled, farm artifact domains.
Sixth, check weekly bosses. If discounted weekly claims are available and useful, do them.
This order keeps Resin connected to real progress.
Best Weekly Resin Routine
A good weekly Resin routine balances guaranteed upgrades and long-term farming.
At the start of the week, complete discounted Weekly Boss claims if you need the materials. Then check which talent and weapon domains are available on each day. Plan around the schedule instead of wasting Resin on the wrong day.
During the week, use Resin for character ascensions, weapon materials, talents, and artifacts. If you are busy, craft Condensed Resin and use it later on domain days.
A simple weekly plan:
Monday: weekly bosses and planning.
Tuesday to Friday: talent books, weapon materials, bosses, or artifacts.
Weekend: catch-up farming because many domains are more flexible depending on the current schedule and available content.
Any day: Ley Lines when Mora or EXP is low.
This routine keeps the account moving without feeling random.
Best Resin Strategy for Free-to-Play Players
Free-to-play players should be extra careful because Primogem Resin refreshes are usually not worth it. F2P players should protect Primogems for Wishes and make the most of natural Resin, Fragile Resin, and Transient Resin.
The best F2P Resin strategy is:
Never let Resin cap if possible.
Save most Fragile Resin until valuable farming stages.
Use Transient Resin before it expires.
Prioritize guaranteed upgrades before artifacts.
Build flexible supports.
Farm efficient artifact domains.
Use Condensed Resin to save time.
Avoid building too many characters at once.
Do not spend Resin on materials for characters you may never use.
F2P accounts become strong through focus. Building one good team first is better than half-building many characters.
Best Resin Strategy for Casual Players
Casual players should use Resin in a way that supports enjoyment. If you do not play every day, Condensed Resin becomes very useful because it lets you save Resin for days when you have more time.
A casual Resin plan can be simple:
Log in.
Spend Resin or craft Condensed Resin.
Do commissions or events if available.
Upgrade one character slowly.
Do not worry about perfect artifacts.
Casual players should focus on comfort. A good healer, a strong main DPS, and a few useful supports can make the game enjoyable without strict optimization.
The main mistake casual players should avoid is letting Resin cap for long periods while also feeling stuck. Even a few quick Ley Lines or boss claims can keep progress moving.
Best Resin Strategy for Endgame Players
Endgame players usually use Resin for optimization. They may already have built characters, so Resin often goes into artifacts, final talent levels, new character preparation, and roster expansion for Spiral Abyss or Imaginarium Theater.
Endgame Resin priorities include:
Artifact optimization.
Leveling more supports.
Preparing new characters.
Crowning important talents.
Farming Weekly Boss materials.
Building wider rosters for Imaginarium Theater.
Improving second and third teams.
Endgame players should avoid farming only one artifact domain forever if the improvement chance is tiny. Sometimes building a new support or improving another team gives more value than chasing one better substat.
At endgame, Resin efficiency is about account-wide improvement, not only one character showcase.
Should You Pre-Farm With Resin?
Pre-farming means collecting materials for a character before you fully build them or before they release. It can be useful, but it can also be risky.
Pre-farm when:
You are sure you will build the character.
You know the correct materials.
You have already built your current team enough.
You have Resin available after important upgrades.
Avoid pre-farming when:
You are not sure you will pull the character.
Material information is uncertain.
Your current team is weak.
You are ignoring urgent upgrades.
Pre-farming can save time later, but it should not damage your current account progress.
Resin and Adventure Rank Progression
Spending Original Resin also gives Adventure EXP. Original Resin gives 50 Adventure EXP for every 10 Resin spent, which means Resin spending helps account progression while also farming materials.
This is one reason daily Resin spending is so important for beginners. It does not only give materials. It also helps Adventure Rank rise.
However, do not spend Resin only for Adventure Rank. Spend it on materials you need. Adventure EXP will come naturally while your account gets stronger.
Fast Adventure Rank with weak characters can create World Level problems. Smart Resin use keeps your team ready for higher difficulty.
Common Resin Mistakes to Avoid
One common mistake is letting Resin stay capped. Capped Resin stops regeneration and wastes future value.
Another mistake is farming artifacts too early. Before AR45, heavy artifact farming is usually inefficient.
Another mistake is ignoring weapon materials. Weapon upgrades are reliable and important.
Another mistake is ignoring talents. Talents can greatly improve damage, healing, shielding, and support value.
Another mistake is farming random bosses. Boss materials only matter if your characters need them.
Another mistake is spending Primogems on Resin refreshes. Most players should save Primogems for Wishes.
Another mistake is using Fragile Resin without a plan. Save it for valuable farming.
Another mistake is building too many characters at once. Resin cannot support everything immediately.
Another mistake is overfarming one artifact set while the rest of the account is weak.
Avoiding these mistakes will make your Resin feel much more valuable.
Best Resin Checklist
Use this checklist before spending Resin:
Is my main DPS ascended enough?
Is my main weapon leveled?
Are important talents upgraded?
Do I need boss materials?
Do I need weapon ascension materials?
Do I need talent books today?
Am I low on Mora?
Am I low on EXP books?
Are discounted weekly boss rewards still available?
Am I AR45 or higher for serious artifact farming?
Can this domain help multiple characters?
Will this Resin improve a character I actually use?
If the answer points to a clear upgrade, that is probably a good Resin use.
How BoostRoom Helps With Resin Planning
BoostRoom helps Genshin Impact players stop wasting Resin and start building accounts with a clear plan. Many players feel stuck because they farm randomly, chase artifacts too early, ignore talents, or spend Resin on materials they do not need.
A strong Resin plan looks at your characters, teams, Adventure Rank, weapons, talents, artifacts, Mora, EXP books, and future goals. The best farming choice for one account may be completely different from the best choice for another account.
BoostRoom helps players understand what should come first. Sometimes the answer is bosses. Sometimes it is talents. Sometimes it is weapon materials. Sometimes it is Ley Lines. Sometimes it is finally time to farm artifacts.
Better Resin planning means stronger characters, smoother progression, easier bosses, better domains, stronger Spiral Abyss attempts, and less frustration.
FAQ
What is Original Resin in Genshin Impact?
Original Resin is the resource used to claim rewards from many progression activities, including domains, Ley Line Outcrops, Normal Bosses, and Weekly Bosses.
How fast does Original Resin regenerate?
Original Resin regenerates at 1 Resin every 8 minutes until it reaches the cap of 200.
How much Resin do players get per day?
Players naturally regenerate 180 Resin every 24 hours if they keep Resin below the cap.
What should beginners spend Resin on first?
Beginners should spend Resin on character ascension materials, weapon ascension materials, talent books, Mora, EXP books, and useful boss drops before serious artifact farming.
When should I start farming artifacts?
Most players should start serious artifact farming around AR45, when high-level artifact domains become much more valuable.
What is Condensed Resin used for?
Condensed Resin stores Original Resin and can be used to claim multiple reward sets at once from domains and Ley Line Outcrops. It saves time and helps prevent Resin overcapping.
Can Condensed Resin be used on bosses?
No. Condensed Resin cannot be used to claim rewards from Normal Bosses or Weekly Bosses.
Should I use Fragile Resin early?
Most beginners should save Fragile Resin until they understand what they need, often around AR45 or later for stronger farming value.
Should I spend Primogems on Resin?
Most players should not spend Primogems on Resin because Primogems are usually better saved for Wishes and limited characters.
Can BoostRoom help with Resin planning?