Snull

Armor Class 14

Hit Points 99 (18d4 + 54)

Speed 20 ft.

Initiative +4

Damage Immunities poison

Condition Immunities poisoned

Senses darkvision 60ft., passive Perception 11

Languages —

Challenge 3 (700 XP)

Headbutt. Melee Weapon Attack: +2 to hit, reach 5 ft., one target. Hit: 1 (1d4 + 1) bludgeoning damage plus 9 (2d8) necrotic damage.

Withdraw. The snull withdraws into its skull. Until it emerges, it gains a +4 bonus to AC and has advantage on Dexterity (Stealth) checks. While in its skull its speed is 0 and can't increase, it has disadvantage on Dexterity saving throws, it can't take reactions, and the only action it can take is a bonus action to emerge.

Sliding Retreat. In response to taking damage the snull moves up to half its speed, without provoking opportunity attacks.