Multiattack

Ia'Affrat makes three Bite or Burning Claw attacks, or he makes four Flaming Insect Bolt attacks.

Bite (Shapeless Form Only)

Melee Weapon Attack: +10 to hit, reach 0 ft., one target in the swarm's space. Hit: 21 (6d6) piercing damage plus 14 (4d6) poison damage, or 10 (3d6) piercing damage plus 7 (2d6) poison damage if Ia'Affrat has half of its hp or fewer. If the target is a creature, it must succeed on a DC 18 Constitution saving throw or be poisoned until the end of its next turn.

Burning Claw (Humanoid Form Only)

Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 23 (4d8 + 5) slashing damage plus 10 (3d6) fire damage.

Flaming Insect Bolt

Ranged Spell Attack: +11 to hit, range 120 ft., one target. Hit: 16 (3d6 + 6) fire damage plus 10 (3d6) poison damage.

Inhabit (Shapeless Form Only)

Ia'Affrat crawls into the body of a Humanoid, or a Humanoid corpse that has been dead no more than 7 days, that he can see within 5 feet of him. If the target is unwilling, the target must succeed on a DC 18 Constitution saving throw or the target loses control of its body, and Ia'Affrat takes control of the body. Ia'Affrat controls the body but doesn't deprive the target of awareness. Ia'Affrat can't be targeted by any attack, spell, or other effect, and he retains his alignment, his Intelligence, Wisdom, and Charisma scores, his Hurl Flame action and Teleport and Consume Host legendary actions, and his condition immunities. He otherwise uses the target's statistics, but doesn't gain access to the target's knowledge, class features, or proficiencies. If the target was a Humanoid corpse, he uses the statistics it had before it died.