I think I got the legit of one of Ainz Super-Tier
Disaster of Abaddon’s Locust
Abaddon's Locusts (5e Creature) - D&D Wiki
Gargantuan swarm of tiny fiends, neutral evil
Armor Class 18 (natural armor)
Hit Points 877 (65d20 + 195)
Speed 10 ft., fly 60 ft.
STRDEXCONINTWISCHA6 (-2)19 (+4)17 (+3)2 (-4)10 (+0)1 (-5)
Damage Resistances bludgeoning, piercing, slashing
Condition Immunities charmed, frightened, grappled, paralyzed, petrified, prone, restrained, stunned
Senses blindsight 120 ft., passive Perception 10
Challenge 32 (195,000 XP)
Swarm. The swarm can occupy another creature's space and vice versa, and the swarm can move through any opening large enough for a Tiny locust. The swarm can't regain hit points or gain temporary hit points.
Magic Resistance. The swarm has advantage on saving throws against spells and other magical effects.
Drone of Destruction. Any creature that starts its turn in the swarm's space must make a DC 23 Constitution saving throw, taking 35 (10d6) thunder damage on a failed save or half as much on a successful one.
Multiattack. The swarm makes ten attacks: eight with its bites and two with its stingers.
Bites. Melee Weapon Attack: +13 to hit, reach 0 ft., one creature in the swarm's space. Hit: 34 (12d4 + 4) piercing damage, or 19 (6d4 + 4) piercing damage if the swarm has half of its hit points or fewer.
Stingers. Melee Weapon Attack: +13 to hit, reach 0 ft., one creature in the swarm's space. Hit: 19 (6d4 + 4) piercing damage, or 11 (3d4 + 4) if the swarm has half of its hit points or fewer, and the target must make a DC 23 Constitution saving throw. On a failed save, the target becomes poisoned for 150 days.
These locusts were of a monstrous size and shape, 1.7,8, Sc. They were cquipped for ... which is the angel of the hottomless pit, whose name in the Hebrew tongue is Abaddon ...