How to beat the Mimic Boss

The Mimic looks intimidating, but this fight is almost entirely decided by one mechanic: the Mini-Mimic and the healing it enables. If you bring Heal Reduction, the Mimic is one of the easiest bosses in the whole Grim Forest. If you don’t, it turns into a damage race where you can easily get stuck.

You’ll still want good damage (because you’ll effectively be fighting 4v5 a lot of the time), but your “win condition” is simple: stop the boss healing when the Mini-Mimic is present.

His regular skills are mostly nuisance value.

Plunder Pounce (A1) is an AoE that scales harder the more buffs your team has, because it deals additional pure damage based on each target’s Max HP for every buff on them. It can also place Decrease ATK. This isn’t usually what kills you, but if you run very buff-heavy teams, you’ll notice the spike.

Lashing Spiral (A2) is a single-target hit that tries to place a Stun. If the Stun doesn’t land (Block Debuffs, Intercept, or resist), it swings into an AoE follow-up. It also reduces Turn Meter on champions that aren’t stunned. The damage is generally low, so treat this as a tempo/annoyance tool rather than a true threat. Cleansing the Stun or preventing it is helpful, but not required.

Feeding Time! summons a Mini-Mimic and it will always Ingest the champion with the highest Crit Damage. That’s your first big control lever: you can choose who gets eaten by deliberately stacking Crit Damage on a “bait” champion.

While ingested, the champion takes damage equal to 25% of their current HP at the start of the Mimic’s turns. The important detail is “current HP”, meaning it will never kill the champion by itself. After 4 turns (or if the Mini-Mimic is defeated), the champion returns. This isn’t Hydra—your champ isn’t permanently removed.

So why does this mechanic matter so much? Because of the Mimic’s passive.

The passive Fortune’s Feast is what makes (or breaks) this boss.

Every time the enemy team receives 3 buffs, the cooldown of Feeding Time! drops by 1. In real runs, that means if you’re using normal buffs at all, the Mimic can summon Mini-Mimics extremely often. Trying to “kill the Mini-Mimic to free your champ” becomes a trap: you do a bunch of work, then the boss just summons another one and eats someone again.

More importantly, at the start of the Mimic’s turn, if a Mini-Mimic is present, the boss heals for 25% of its Max HP. That’s enormous. Left unchecked, it turns the fight into a treadmill where your damage never sticks.

This is why Heal Reduction is the entire fight. Keep Heal Reduction up, and you can basically ignore the Mini-Mimic loop and just wear the boss down safely.

With Heal Reduction active, the Mimic’s “big problem” stops being a problem. The Mini-Mimic can keep ingesting your bait champion, but the boss won’t get the huge healing that would otherwise stall the fight. Once healing is locked out, the incoming damage is mild, and you can win consistently.

A small timing note that helps: when Heal Reduction is about to fall off, there are moments where the Mini-Mimic disappears and the boss resummons—so you can sometimes afford a tiny gap. But in practice, consistency is king: aim for reliable uptime rather than gambling on timing windows.

Because you can run into this boss across multiple decks in the Grim Forest, the practical approach is to build your decks so you draw Heal Reduction often enough. On Hard difficulty, especially, having at least one Heal Reduction option per deck makes the boss far more consistent. If your roster supports it, two options across a deck can smooth out bad draws.

If you’re missing Heal Reduction, you’re forced into the “intended” method: kill through the healing. That usually means stacking speed control and damage amplification so the boss takes fewer turns, and your damage per turn is high enough to outpace 25% Max HP heals.

The debuffs that matter most in that scenario are Decrease SPD, Turn Meter reduction (it works, but is only 50% effective), and your usual damage amps like Decrease DEF and Weaken. You can also reduce how often Feeding Time comes up by running fewer buffs, since buffs accelerate its cooldown through Fortune’s Feast—but that trade-off often makes your team weaker overall. Realistically, if you’re struggling without Heal Reduction, the best “strategy” is often to route elsewhere, gain more Squad Level stats/curios, and come back stronger.

Because the Mini-Mimic targets the highest Crit Damage, you can plan for it. Put a ridiculous Crit Damage stack on a champion you can afford to lose for a few turns (it doesn’t need speed, accuracy, or even crit rate for this purpose). The Mimic will consistently eat that champion, leaving your core damage dealers active to finish the job.

If you only remember one thing: bring Heal Reduction and keep it up. Do that, and the Mimic becomes a controlled fight where you can ignore the Mini-Mimic loop, accept that one champion will be eaten repeatedly, and steadily burn the boss down.

Plan for Ingest instead of reacting to it. The Mini-Mimic always targets the highest Crit Damage champion, so deliberately bait it onto someone you can afford to lose for a few turns. That champion will never die from Ingest damage alone and will always return.

Don’t waste time chasing the Mini-Mimic unless you absolutely have to. Killing it usually just leads to another one being summoned shortly after, especially if you’re running buffs. With Heal Reduction active, it’s often better to ignore it completely and focus damage on the boss.

If you’re struggling without Heal Reduction, consider rerouting through Grim Forest to gain more Squad Levels, curios, and permanent stats before retrying. The Mimic scales heavily with tempo, and extra speed, damage, or debuff consistency can make a night-and-day difference.

Finally, remember that this boss is far easier to farm consistently than to brute-force. Build for reliability over burst, and the Mimic quickly becomes one of the safest bosses in the entire Grim Forest.