Keen Smell. Vaal has advantage on Wisdom (Perception) checks that rely on smell.

Innate Spellcasting. Vaal's innate spellcasting ability is Charisma. It can innately cast the following spells, requiring no material components:

At will: detect magic, fog cloud, light

1/day each: control weather, gaseous form

3/day each: feather fall, fly, misty step, telekinesis

Multiattack. Vaal makes two morningstar attacks.

Morningstar. Melee Weapon Attack: +12 to hit, reach 10 ft., one target. Hit:21 (3d8 + 8) piercing damage.

Rock. Ranged Weapon Attack: +12 to hit, range 60/240 ft., one target. Hit:30 (4d10 + 8) bludgeoning damage.