Rat King

Medium humanoid (human, shapechanger), chaotic evil

Armor Class 13 in humanoid form, 14 (makeshift armor) in hybrid form
Hit Points 44 (8d8 + 8)
Speed 30 ft.

Str	Dex	Con	Int	Wis	Cha
15 (+2)	16 (+3)	13 (+1)	12 (+1)	12 (+1)	11 (+0)

Skills Perception +3, Stealth +5, Survival +3
Damage Immunities bludgeoning, piercing, and slashing damage from nonmagical weapons that aren’t silvered
Senses darkvision 60 ft., passive Perception 13
Languages Common and one other (can’t speak in rat form)
Challenge 3 (700 XP)

Special Traits

• Keen Smell. The rat king has advantage on Wisdom (Perception) checks that rely on smell.
• Shapechanger. The rat king can use its action to polymorph into a rat-humanoid hybrid or into a giant rat, or back into its true form, which is humanoid. Its statistics, other than its size, are the same in each form. Any equipment it is wearing or carrying isn’t transformed. It reverts to its true form if it dies.
• Sunlight Sensitivity. While in sunlight, the rat king has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.

Actions

• Multiattack (Humanoid or Hybrid Form Only). The rat king makes three attacks, only one of which can be a bite.
• Bite (Hybrid Form Only). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 9 (2d6 + 2) piercing damage. If the target is a humanoid, it must succeed on a DC 12 Constitution saving throw or be cursed with wererat lycanthropy.
• Longsword (Humanoid or Hybrid Form Only). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d10 + 2) slashing damage.
• Summon Rats (1/day). The rat king can summon a swarm of rats. They appear in 1d4 rounds and obey the rat king’s commands.

About

Shadows dance in torchlight as a party of adventurers explores the sewers. Then an odd creature comes into view, it has a strange pointed nose and a long tail. These heroes have wandered into the lair of the Rat King. It unsheathes a glistening longsword and turns towards the intruders.

Underworld Boss. One of the leaders in the underground world of the sewers is this strange lycanthrope.

He commands a legion of wererats, many giant rats, and swarms of rats.

Lycanthrope Leader. Wererats are extremely loyal to their king and will even sacrifice themselves for him. He is incredibly lazy and prefers to have his minions do his dirty work for him. This lycanthrope leader has no trouble sending his henchmen on dangerous missions.

Big Dreams. The rat king dreams of leading a rebellion against the surface dwellers. He has other lycanthrope allies in the city who are ready to fight, namely several werewolves and werebears.