Destroy a Vault Mutations Guide

Mutations are one of the strongest power spikes in Destroy a Vault. A mutated tank keeps its identity but gains a DPS multiplier, so the same robot clears vaults faster and feeds more Gold into the Smelter. You can find mutated variants naturally as luck rises, or force a mutation with Mutation Cores bought for Gems at the Market.

This guide covers how mutations work, how Gems and cores fit the economy, when to apply a core, and why you should always prioritize your best active robots. Pair it with Upgrades for base damage and Economy for currency roles.

What a mutation does

A mutation is a special modifier on a tank robot. Visually it stands out from the standard variant; mechanically it multiplies DPS. Because global Robot Damage and personal DPS upgrades still apply, a mutated keeper snowballs harder than a plain copy of the same rarity. Two equal robots with the same board upgrades are not equal if one is mutated.

Natural mutations show up more often when Robot Luck and Index Luck are high. Index Luck increases every five unique robots and approaches 62.5% with all 76 Index entries. Raising luck is therefore both a collection goal and a mutation farm strategy.

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Gems and Mutation Cores

Gems are the secondary currency. You earn them alongside progression — including from certain vault rewards and codes such as UPDATE (see Codes). Spend Gems at the Market on Mutation Cores. A core lets you manually apply a mutation to a chosen robot instead of waiting for a lucky roll.

Rules of thumb for Gem spending:

• Buy cores when you have a clear target robot already in a slot.
• Do not blow a core on a filler you will replace after the next podium streak.
• Save a small Gem buffer if a code drop or vault event is imminent, then spend deliberately.

Cash still buys boards and slots; Gems are primarily the mutation channel. Mixing the two currencies wrong — for example ignoring Cash damage while hoarding useless cores — slows the account more than missing one mutation.

Natural mutations vs forced cores

Natural rolls are free beyond the roll cost. When a mutated variant appears on the podium, prioritize buying or keeping it over a plain duplicate of a weaker tank. If Cash is tight, it can still be correct to take a mutated mid-tier piece over a plain high-tier you cannot afford to upgrade yet — the multiplier often wins short-term Gold/hour.

Mutation Cores remove RNG at a Gem price. Use them when:

1. You already own your best-in-slot robot for the current island.
2. That robot is not mutated yet.
3. You are done (or nearly done) funding critical Upgrades so the multiplier has a strong base to scale.

If your best robot is about to be replaced by a fused version, wait — fusion rules are in Robot Fusion. Mutating a unit you will discard wastes the core.

Priority: which robots to mutate first

Apply multipliers where uptime is highest:

1. Active slot leaders — robots that stay on vaults all session.
2. Already upgraded DPS tanks — cores multiply invested Cash.
3. Fused robots (after island two) — rare, strong bases deserve multipliers.
4. High Index rarities you will keep — long-term collection pieces.
5. Never — temporary commons you re-roll away for Index padding only.

If two candidates are equal, prefer the one with better personal DPS upgrades and battery synergy from the global boards.

When mutations matter in progression

Early game: Focus on slots, Robot Damage, and Battery (Getting Started). Take natural mutations if they appear, but do not drain Gems before your army can clear efficiently.

Mid game: Robot Luck and Index progress rise. Natural mutations become common enough to reshape your lineup. Start buying cores for confirmed keepers. Market trips should follow smelt sessions so you know Cash and Gem balances together — see Economy.

Late game: Nearly every permanent slot should be mutated if possible. Combine mutated fused tanks with Vault Gold Value upgrades for maximum Gold per clear. At this stage, cores are maintenance tools whenever a new best robot arrives unmutated.

Market workflow

A clean mutation session looks like this:

1. Smelt Gold → note Cash and Gem totals.
2. Confirm which slotted robots lack mutations.
3. Buy Mutation Cores at the Market for Gems.
4. Apply cores to priority targets only.
5. Dump remaining Cash into damage/battery or slot expansion.
6. Resume rolling with higher luck for natural extras.

UI locations for the Market and boards are summarized in Controls.

Synergy with luck and fusion

Luck systems feed mutation rate; fusion feeds base power. Ideal endgame pieces are often fused + mutated + personally upgraded, sitting under strong global Robot Damage and Battery. Do not fuse already-fused robots, and plan cores around the post-fusion unit when you are close to a 4-of-a-kind.

Index chasing remains worthwhile even after you have strong mutants: every five new uniques still add Index Luck, improving future natural mutation odds for the rest of the roster.

Mistakes to avoid

• Mutating a robot you replace ten minutes later.
• Ignoring global damage so a mutated weak tank still clears slowly.
• Spending all Gems the moment you can afford one core with no target plan.
• Skipping Codes that grant Gems before a Market run.
• Leaving mutated robots off slots while plain tanks work the vault.

Mutations reward intentional roster decisions. Treat cores like limited crafting materials: expensive, powerful, and wasted on junk. For the wider roadmap, return to the Guides Hub or compare keepers on the Tier list once you understand multipliers.

Quick reference

Resource	Role in mutations
Robot Luck / Index Luck	Raises natural mutation odds
Gems	Buy Mutation Cores at Market
Mutation Cores	Force a mutation on a chosen robot
Cash upgrades	Raise the base DPS the multiplier scales
Active slots	Where mutated DPS actually earns Gold

Master that table and mutations stop feeling random — they become another controlled upgrade path beside boards and fusion.