Boss rounds: what happens and how to prepare
By Khaan · Updated Sep 23, 2026
A Boss comes every 3 rounds, and many games turn there: a strong deck that shows up unprepared takes huge damage.
When the Boss comes
officialRounds 3, 6, 9, 12 and so on (the game's round table). Rounds 4, 7 and 10 bring the Fated Gift, right after the Boss.
communityYou can check which Boss is coming by tapping the rounds in the top-left corner.
The Boss swallows your Rush Squad
officialWhen a boss is summoned, it absorbs all Rush Squad Units to increase its HP. The Rush Squads and bosses summoned have a higher HP the greater your Minions' ATK.
officialHow much of your Rush Squad HP becomes Boss HP, by trophy range and round:
| Trophy range | R3 Boss | R6 Boss | R9+ Boss |
|---|---|---|---|
| 0 - 99 | 50% | 50% | 50% |
| 100 - 199 | 50% | 50% | 50% |
| 200 - 999 | 50% | 60% | 70% |
| 1000 - 1599 | 50% | 65% | 80% |
| 1600 - 2199 | 50% | 75% | 100% |
| 2200 - 4999 | 50% | 75% | 100% |
confirmedEvery Minion on board sends units each round, temporaries included, so summon and many-copy decks fatten the Boss more.
The match clock
officialRush Squad Units deal 5 damage to the Captain, while the boss' damage increases during later rounds. And enemy HP climbs round by round, the same at every range:
See the numbers as a table
| Round | Enemy HP |
|---|---|
| R1 | x2 |
| R2 | x2.1 |
| R3 | x2.3 |
| R4 | x2.6 |
| R5 | x3 |
| R6 | x3.5 |
| R7 | x4.1 |
| R8 | x4.8 |
| R9 | x6 |
| R10 | x8.5 |
| R11 | x15 |
| R12 | x25 |
The Bosses and what answers each one
communityBehavior: in-game description. Answers: what the community uses, checked against the cards' official text.
| Boss | What it does | What answers it |
|---|---|---|
| Big Slime | Splits into medium, then small Slimes | Area and multi-target damage |
| Swift Snail | Spawns with Shield and gains more; each stack blocks 1 hit | Many fast hits |
| Terror Moth | Lowers all your Minions' ATK, more and more | Ready buffs that renew every round |
| Lord Caterpillar | Summons caterpillars every few seconds | Multi-target |
officialMuscle Melon deals 200% damage to the enemy boss (800% at 4★ in Rumble Chess): the most direct answer.
officialPop Gunner fires a volley of 4/5/6 bullets: many hits break the Swift Snail's Shield.
officialApple Sheriff attacks 6/7/8 enemies at once, and Boom Shroom attacks all of them: good against the Slime splits and the caterpillars.
communityThe community also uses Bombercarrot, Violet Magus, Bardcore Onion and Berrinetta in these rounds.
Pre-Boss checklist
- wikiHave at least 1 answer on board before pressing Ready on R3. Many-body deck: have 2.
- communityMany-body deck: merging pairs the round before the Boss (R2, R5, R8) keeps it leaner. Merges can't be undone, so in a wide deck it's a permanent trade.
- wikiCheck which Boss is coming and whether your deck has its answer in the table above.
Each Boss's base HP by round is on the Bosses page, and the Bosses tab of the game plan in the deck builder shows what YOUR deck has against each one.
- Game tables TurnCfgBase, TurnConfig and LadderMatch, version 2.0.1021.0 (datamine).
- Official in-game loading tips (LoadingTip table).
- Official ability text of the cards mentioned.
- Boss behavior and answers: in-game description and community guides.
- Rush Squad units per Minion, temporaries included: confirmed by Khaan in game.