based on D&D 5th Edition
Huge  Fiend Demon, Chaotic Evil

Armor Class 18  (natural)
Hit Points 200  (16d12+96)
Speed 20 ft. , fly 30 ft. , swim 10 ft.

21  (+5) 10  (0) 22  (+6) 19  (+4) 12  (+1) 15  (+2)
Saving Throws Con +11, Int +9, Wis +6, Cha +7
Damage Resistances Bludgeoning, Fire, Frost, Lightning, Piercing, Slashing
Damage Immunities Poison
Condition Immunities Poisoned
Senses truesight, passive Perception 11
Languages Abyssal, Telepathy
Challenge 13  (0 XP)
Teleport. Teleport 120 ft. to unoccupied space it can see.
Siege Monster. Deals double damage to objects and structures..
Magic Resistance. Has advantage on spell and magic saving throws.
Multiattack. Use Horror Nimbus, followed by one bite and two claws attacks.
Bite. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 32 (5d10+5) piercing damage.
Claw. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 15 (3d6 +5) slashing damage.
Horror Nimbus. (Recharge 5-6) DC 15 Wisdom saving throw, frightened. Save at end of each turn, successful save creature becomes immune. in 15 Area