Huge Monstrosity, typically Chaotic Evil
Armor Class 17 (natural armor)
Hit Points 218 (19d12 + 95)
Speed 30 ft., swim 30 ft., fly 30 ft.
STR
20 (+5)
DEX
12 (+1)
CON
20 (+5)
INT
6 (-2)
WIS
12 (+1)
CHA
12 (+1)
Skills Perception +9
Senses darkvision 60 ft., passive Perception 19
Languages understands Draconic but can't speak
Challenge 11 (7200 XP)
Proficiency Bonus +4
Multiple Heads.
Reactive Heads.
Wakeful.
Actions
Multiattack.
Bite.
Prismatic Breath (Recharge 4-6).