Special Trait Name. speaks in all languages at once.

Spellcasting. spell save DC 16, +6 to hit with spell attacks). Zuul has following spells prepared:

Shocking grasp

Lightning springs from your hand to deliver a shock to a creature you try to touch. Make a melee spell attack against the target. You have advantage on the attack roll if the target is wearing armor made of metal. On a hit, the target takes 1d8 lightning damage, and it can't take reactions until the start of its next turn.

Lightning Bolt

A stroke of lightning forming a line 100 feet long and 5 feet wide blasts out from you in a direction you choose. Each creature in the line must make a Dexterity saving throw. A creature takes 4d6 lightning damage on a failed save, or half as much damage on a successful one.

Action Name. 1 attack per turn

Once Zuul hits 0 hit points everyone must make a wisdom saving throw on failed save the Stay Puft Marshmallow man spawns.