Collection Items

Doll (Collection Item) and Treasure (Favorite Item) are the center of NIKKE's endgame investments as they deal with base stat and crucial passives like Damage Taken Reduction, Cover HP Increase, and Multipliers Increase. As Solo Raid and PvP become accessible to more and more players, and as the roster of meta Nikkes continues to grow, knowing whom to equip your Dolls on and whom to prioritize first is crucial for maintaining long-term sustainability.

This guide will be divided into three sections: why, what, and how. All bases of questions will be covered, so by the end of reading this guide, you will be able to walk on your own. Should you still have questions, don't hesitate to contact us on our Discord.

Your first question is likely:

Why are Dolls important?

Let's be specific. We usually equip Dolls for five main reasons:

• Base Stat: Units hit harder if they have higher ATK and survive longer with more HP. Higher stat also relatively benefits some units more, such as those with higher ATK/HP skills (either for self or allies), such as Rapi: Red Hood & Rouge.
• CP Boost/Padding: Some content rewards higher CP, although it is not a reliable numerical rating for a team's strength. In Campaign, higher CP means less stat penalty from deficit. In PvP, higher CP possibly allows you to CP-gap the enemy, reducing their stat significantly if they go below a certain threshold %.
• Weapon-Specific Skills: Dolls offer a weapon-specific skill that might be impactful on some units. For example, Sniper Rifle Dolls increase Base Charge Multiplier. Someone like Alice or Red Hood would definitely love that.
• Damage Taken Reduction: SR+ Dolls offer Damage Taken Reduction. On some bosses, this Reduction can be the deciding factor between life and death. One of the recent raids against Mother Whale literally forced players to invest their units to a minimum SR 5/15! Not only that, but Reduction is also essential in PvP, where every drop of HP matters. The Cover HP Increase from Dolls can also have a dramatic impact on PvE.
• Treasure: Some units possess Treasure/Favorite Item, a buffed kit that unlocks after obtaining SR 15 Doll and Bond 30 (from 2★ LB). SR 15 is a hard requirement.

When one of these goals is satisfied, we usually consider the unit worthy of Doll. Whether you upgrade that Doll later is a different question that we will answer in the next section. This list is only to let you know that upgrading Doll will always have at least one of these as the main reasons. Take a look at the table to see the stats in detail:

Every 5 levels is a breakpoint. You should level from breakpoint to breakpoint whenever possible. Pay attention to the absent Damage Taken▼ and Cover Max HP▲ from R Dolls as these are often important perks. They are noteworthy incentives for upgrading to SR. That said, R 15 Doll has better regular stats than SR 0 despite missing the bonus skills.

Now that you know why we give Dolls, the next logical question is What. So, how do you know which units to equip Dolls on and which to prioritize? Generally, we follow a simple rule of thumb:

• Versatility: A unit with a higher presence or that is seen more in use than other units has a higher priority of being Dolled. For example, Siren/Little Mermaid is used in every game mode, including PvP, so investing in her yields a higher return.
• Immediacy: What you need to Doll now is different from what others need to Doll now. When we are talking about immediacy, we are talking about which units would be most rewarding to invest in right now. For example, if your next Campaign boss wall is a Mirror Container, Doll-ing Cindy & Ein might be a good idea. Similarly, if the next Solo Raid is Wind-weak, Doll-ing SBS & AsukaW seem to be the better choice. Ideally, you should be able to judge immediacy yourself because it is affected by what units you have, etc. It's very sensitive.
• Profitability: Like we mentioned earlier, some units scale on Dolls better than others. Someone who has a skill that says "Affects self: ATK▲ 200%" or "Affects all allies: ATK▲ 20% of caster's ATK" should be prioritized. This is because they will yield higher returns when we deal with stat-sensitive content like Solo Raid. That said, profitability can also take on other forms. Someone like Liter doesn't benefit from increased base stat but enjoys Damage Reduction and CP Padding. Does that mean she is not profitable? Not if those bonuses are necessary to complete a run. If those are not necessary, then, yes, it’s a waste.

Below is our table of recommendations listing which units are worth Doll-ing sorted by Priority. Priority is determined based on Versatility & Profitability combined. Focus on units that are immediately useful to you; otherwise, prioritize Versatility over Profitability (read the Notes). You can also use the Tier List to comprehend the power level of a unit as a whole. Note that a unit can have a high Doll priority but rank lower in the Tier List if Profitability is high.

Note: For units with Treasure, the priority for Treasure is written in their Treasure versions. Their normal versions will also have numbers, but those are only for their non-Treasure versions!

Mind the Game Mode: High Priority in PvP doesn't mean High Priority in PvE!

Why is Immediacy not here? Immediacy is different from one person/account to another and changes based on the upcoming content. Hence, suggestions based on immediacy would be inconsistent. However, here are some units that have niche uses that might be important:

• 
  Ein: Used against some niche bosses like Mirror Container. The BiS DPS. There is a Campaign Wall Mirror Container that highly benefits Ein investors.
• 
  Crust: Situational in Union Raid. She can dispel debuffs at will, very convenient. Not really used anywhere else unless you lack better B2. Not worth investment for most players.
• 
  Mica: Snow Buddy: Similar to Crust, a niche dispeller for Union Raid. Not worth investment for most players.

Note that all these suggestions apply to both equipping and upgrading. But, wait! Read the next section first, so you know exactly how to.

The most important question: How to Doll. There is no point in knowing all the wisdom without knowing how to make use of it, so let's get started.

Before we proceed, let’s first discuss the 6 major Doll stages:

• No Doll: Your unit has no Doll.
• R 0: Good for prepping for future investments. If you plan not to invest in this unit's Doll at all, avoid R 0 entirely.
• R 15: This builds a foundation toward SR 5. A unit with R 15 Doll can be replaced with an SR Doll, and the transferred EXP will make it Lv. 5 instantly. R 15 is better than SR 0 for pure stat but has no Damage Reduction/Cover HP increase.
• SR 0: Better if you want to put a usable Doll immediately without spending any resources (or have no plans on upgrading later). It is worse for later upgrading because materials → EXP efficiency is worse than if you start with an R 0 and convert it into SR 5 later.
• SR 5: The ideal stopping point for most units, if you want to cheap out. Further upgrades are expensive but worth it for some and may be required.
• SR 15/Treasure: These should be reserved for influential units, those with either high versatility or high profitability. Sometimes, they may be required for the Damage Reduction. Treasure units also need SR 15.

Your ideal route is R 0 → R 15 → SR 5 (→ SR 15) if you think you would use the unit a lot and that investing in her is worth it. This is the most resource-efficient path. If you think you will not be investing in them anytime soon, are not planning to invest at all, or are out of materials, yet the requirement is urgent (e.g. SR is coming/ending), then an SR 0 is defensible. While upgrades later down the road will be more expensive, you don't need any resources now. Besides that, the difference in efficiency between the two routes is minimal (~25% or ±50 Blue Kits). This can be a good temporary compromise.

Tip

We covered resource management in our Collection Items - Upgrade Optimization Guide. Following the “Smart Allocation” approach, the summary is to use Blue Maintenance Kits from R 0 → R 15, Purple from SR 5 → SR 10, and Gold from SR 10 → SR 15. However, if you have too many Blue Kits that Purple and Gold become the bottleneck, consider using Blues/Purples to pad from SR 5 → SR 6/7 or SR 10 → SR 11 before Purple/Gold. The goal is to balance all color consumptions.

Remember that R Dolls DO NOT give Damage Reduction or Cover HP Increase. If those are important, consider SR. For example, in PvP, R 0/R 15 is not ideal because the most important aspect of Dolls there is Damage Reduction. Hence, an immediate SR 0, R 15 → SR 5, or SR 15 is more recommended.

There is also ♞Treasure/Favorite Item. To unlock a unit’s ♞Treasure kit, the eligible unit must be Bond 30 (2★ LB) + SR 15. If you don't have 2★ Limit Breaks yet, do not invest unless the units are still good without Treasure. Once you have enough and are ready to Treasure, prepare to SR 15 (and collect related Upgrade Kits from Daily Dispatch to advance the Phases). Prioritize Dolling important Treasure characters first because unlocking their Treasure Kit grants a huge strength boost, then you can go back to your normal farming routine. You will need 160 Upgrade Kits to unlock and advance a Treasure Kit from Phase 1 to Phase 3.

Tip

50 is needed from Phase 1 → 2 and 110 is needed from Phase 2 → 3. Sometimes, the unit is already good enough in Phase 2, and you can pivot to another unit if you’re building more than one at the same time!

Note: Some units' Treasure Kits peak in Phase 1, 2, or 3. It's not always 3 and sometimes 3 can be worse than 2. Read their corresponding character Treasure guides for more info.

Start by equipping and selecting the rarity you want.

Tap “Maintain” to level up your Doll using Maintenance Kits.

Tap “Change” to replace your R doll with the SR version, transferring the EXP over as explained before.

There are currently 3 main ways to obtain Dolls/Collection Items:

• Daily Dispatch
• Monthly Solo Raid
• Recycling Shop/Coop Shop

Dispatch

Every day, you can go to Outpost → Bulletin Board, where you can 'Dispatch' your Nikkes to gain some rewards. Depending on your Tactics Academy's level, you will be able to access special Dispatch missions, which give Collection Items-related items. We suggest researching those levels as soon as possible despite their steep costs.

You can have a maximum of 4 (+1) Special Dispatch missions per day, with 3 types of rewards:

• Maintenance Kit: Essential materials used for upgrading a Doll's level.
• Collection Mileage Box: A gacha box where you can obtain either R or SR Dolls.
• Special Dispatch: Field the unit you want the Favorite Item for and get 3 relevant Favorite Maintenance Kits.

You can reroll Dispatch missions in the hope of better rewards. Check our optimization guide here:

Solo Raid

Every month, we have a Solo Raid, an individual game mode where you form up to 5 teams to deal as much damage as possible to a boss while competing against others.

When you clear all levels for the first time, you will receive in total:

• 6 random R Doll (random weapon type)
• 2 random SR Doll (random weapon type)
• 1 SR Doll selector (pick your desired weapon)
• 30 Random Favorite Maintenance Items

Clearing Solo Raid stages daily also gives you Maintenance Kits. If you do all 3 tries of Solo Raid every day (excluding challenge mode attempts), you will get 12× Maintenance Kit Box and 17× Maintenance Kit Box II in total. These give R, SR, or SSR Maintenance Kits by chance.

Recycling Shop/Coop Shop

Often, every 2 weeks (or shorter), we get a Coordinated Operation over the weekend. In this game mode, you team up with 4 other players in a public or private lobby to challenge a boss and score as highly as possible while competing against other teams.

Coordinated Operation rewards Rusted Bones depending on your rank. You can exchange Rusted Bones for Maintenance Kits in the Recycling Shop/Coop Shop, up to 5 times per week. You should prioritize the Curated Manufacturer Arms, however. We recommend finding servers where you can find others to team up with (or be carried by) to get at least Top 10%.