Rat King
Small monstrosity, unaligned
Armor Class14
Hit Points 112 (15d6 + 60)
Speed30 ft., climb 15 ft., swim 15 ft.
Str12,Dex19,Con18,Int5,Wis14,Cha11
Condition Immunities charmed, frightened, paralyzed, petrified
Sensesdarkvision 60 ft. passive Perception 12
Languages-
Challenge5 (1800 XP)
Keen Smell. The rat king has advantage on Wisdom (Perception) checks that rely on smell.
Speak With Rats. The rat king can communicate with normal rats (including giant rats).
Actions
Multiattack. The rat king makes five bite attacks.
Bite.Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 6 (1d4+4) piercing damage. If the target is a creature, it must succeed on a DC 14 Constitution saving throw or contract a disease. Until the disease is cured, the target can’t regain hit points except by magical means, and the target’s hit point maximum decreases by 3 (1d6) every 24 hours. If the target’s hit point maximum drops to 0 as a result of this disease, the target dies.
Sometimes, several rats, endlessly writing in the darkness and muck, end up with their tails entangled and eventually knotted together. Sometimes, when this happens, the pain and torment of their restrained existence causes the rats’ sentience to merge into one single creature. Thoroughly infested with disease, the sight of a rat king can be enough to send an entire city into panic for the illnesses it may spread. A rat king is about 3 feet tall and weighs around 15 pounds.
Originally from the Pathfinder Bestiary 4.