Hellbat

Armor Class 15

Hit Points 144 (17d10 + 51)

Speed 15 ft., fly 75 ft.

Initiative +3

Damage Resistances cold, fire, lightning; bludgeoning, piercing, and slashing from nonmagical weapons

Damage Immunities poison

Condition Immunities poisoned

Saving Throws Dex +5, Cha +4

Senses blindsight 60 ft., passive Perception 13

Languages understands Abyssal but can't speak

Challenge 6 (2,300 XP)

Source Monster a Day

Multiattack. The hellbat makes two bite attacks.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one creature. Hit: 10 (2d6 + 3) piercing damage, and the hellbat regains 3 (1d6) hit points.