Slime Boss is one of the three act 1 bosses in Slay the Spire. It is the third in the first-time order, after The Guardian and Hexaghost.
Slime Boss
| Normal | Ascension | |
|---|---|---|
| HP | 140 | 150 from A9 |
| Slam | 35 damage | 38 from A4 |
| Goop Spray | 3 Slimed into your discard pile | 5 from A19 |
It always opens with Goop Spray, then Preparing, then Slam, and repeats.
The split
When Slime Boss drops to half its max HP or less (70, or 75 from A9), its next move is Split. It dies and is replaced by a Spike Slime (L) and an Acid Slime (L), each with Slime Boss's HP at the moment it split.
So every point of damage before the split counts twice: hitting Slime Boss from 71 down to 40 in one turn gives two slimes with 40 HP each instead of 70. Each large slime splits again into two medium slimes at half its own HP.
Poison on Slime Boss does not carry over to the slimes.
Silent cards that hit every slime
After the split you face two, then up to four slimes. Unupgraded values, with upgrades in brackets:
| Card | Cost | Effect |
|---|---|---|
| Dagger Spray | 1 | 4 (6) damage to all enemies twice |
| Die Die Die | 1 | 13 (17) damage to all enemies, Exhaust |
| All-Out Attack | 1 | 10 (14) damage to all enemies, discard 1 card at random |
| Crippling Cloud | 2 | 4 (7) Poison and 2 Weak to all enemies, Exhaust |
| Noxious Fumes | 1 | 2 (3) Poison to all enemies at the start of each turn |
| A Thousand Cuts | 2 | 1 (2) damage to all enemies whenever you play a card |
| Corpse Explosion | 2 | 6 (9) Poison; when that enemy dies, deal its max HP to all enemies |
| Piercing Wail | 1 | All enemies lose 6 (8) Strength this turn, Exhaust |
Noxious Fumes and poison you apply after the split keep working on every slime; Poison applied to Slime Boss before the split is lost.
Slimed
Slimed is a status card that costs 1 energy to play and Exhausts. Goop Spray adds 3 to your discard pile every third turn until the split.
See act structure for the other act 1 bosses.