Armor Class 18 (natural armor)
Hit Points 138 (12d10 + 72)
Speed 40 ft., fly 40 ft., burrow 40 ft.
Saving Throws Str +9, Dex +7, Con +10, Wis +6, Cha +9
Skills Acrobatics +11, Athletics +9, Perception +6, Stealth +7
Damage Immunities cold, lightning, poison
Condition Immunities poisoned
Senses darkvision 120 ft., truesight 60 ft., passive Perception 16
Languages Abyssal, Common, Draconic, Elvish, Infernal, telepathy 60 ft.
Challenge 12 (8,400 XP)
Cloak of Swarms. Akyishigal emits a cloud of flying, stinging insects from his mouth, eyes, and tears in his skin that spreads out in a 5-foot radius from him. At the start of each of his turns, Akyishigal chooses whether this cloak is active.
Legendary Resistance (3/Day). If Akyishigal fails a saving throw, he can choose to succeed instead.
Magic Resistance. Akyishigal has advantage on saving throws against spells and other magical effects.
Multiattack. Akyishigal makes four Claw attacks.
Claw. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 14 (2d8 + 5) slashing damage plus 3 (1d6) poison damage.
Call Spawn (1/Day). Akyishigal magically calls one spawn of Akyishigal. The spawn arrives in 1d4 rounds, acting as an ally of Akyishigal and obeying its telepathic commands. The spawn remains for 1 hour, until Akyishigal dies, or until Akyishigal dismisses it as a bonus action.
Spellcasting. Akyishigal casts one of the following spells, requiring no material components and using Charisma as the spellcasting ability (spell save DC 17):
At will: detect evil and good, pass without trace
3/day: dispel magic, giant insect, insect plague
1/day: contagion (filth fever only)
Akyishigal can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. Akyishigal regains spent legendary actions at the start of his turn.
Teleport. Akyishigal magically teleports, along with any equipment he is wearing or carrying, up to 120 feet to an unoccupied space he can see.
Skitter (Costs 2 Actions). Akyishigal moves up to half his speed and makes one Claw attack. This movement doesn't provoke opportunity attacks.
Cast a Spell (Costs 2 Actions). Akyishigal uses Spellcasting.