Emperor Crab is a boss encounter in Slay the Spire 2, found in Hive.

| Action | Normal Effect | 🔥 Ascension EffectA9+ |
|---|---|---|
| Thrash | Deal 12 damage. | Deal 14 damage. |
| Enlarging Strike | Deal 4 damage. | Deal 4 damage. |
| Bug Sting | Deal 6 damage 2 times. (12 total) Apply 2 Weak and 2 Vulnerable. | Deal 7 damage 2 times. (14 total) Apply 2 Weak and 2 Vulnerable. |
| Adapt | Gain 2 Strength. | Gain 2 Strength. |
| Guarded Strike | Deal 12 damage. Gain 18 Block. | Deal 14 damage. Gain 18 Block. |
| Targeting Reticle | Deal 3 damage. | Deal 4 damage. |
| Precision Beam | Deal 18 damage. | Deal 20 damage. |
| Charge Up | Gain 2 Strength. | Gain 2 Strength. |
| Laser | Deal 31 damage. | Deal 35 damage. |
| Recharge | Skip turn (no action). | Skip turn (no action). |
This is a composite encounter with 2 enemy units fighting together.
| Action | Normal Effect | 🔥 Ascension Effect |
|---|---|---|
| Thrash | Deal 12 damage. | Deal 14 damage. |
| Enlarging Strike | Deal 4 damage. | Deal 4 damage. |
| Bug Sting | Deal 6 damage 2 times. (12 total) Apply 2 Weak and 2 Vulnerable. | Deal 7 damage 2 times. (14 total) Apply 2 Weak and 2 Vulnerable. |
| Adapt | Gain 2 Strength. | Gain 2 Strength. |
| Guarded Strike | Deal 12 damage. Gain 18 Block. | Deal 14 damage. Gain 18 Block. |
| Action | Normal Effect | 🔥 Ascension Effect |
|---|---|---|
| Targeting Reticle | Deal 3 damage. | Deal 4 damage. |
| Precision Beam | Deal 18 damage. | Deal 20 damage. |
| Charge Up | Gain 2 Strength. | Gain 2 Strength. |
| Laser | Deal 31 damage. | Deal 35 damage. |
| Recharge | Skip turn (no action). | Skip turn (no action). |
| Attribute | Value |
|---|---|
| ❤️ Hit Points | 199🔥 209 (A8+) |
| 💀 Type | Boss |
| ⚡ Skills | 10 skills |
| 📍 Location | Act 2 - Hive |
| Act 1 | Overgrowth | Normal | |
|---|---|---|---|
| Elite | |||
| Boss | |||
| Underdocks | Normal | ||
| Elite | |||
| Boss | |||
| Act 2 | Hive | Normal | |
| Elite | |||
| Boss | |||
| Act 3 | Glory | Normal | |
| Elite | |||
| Boss |