Wererat

Medium humanoid (human, shapechanger), lawful evil

Armor Class 12

Hit Points 33 ( 6d8+6 )

Speed 30ft

STR

10 0

DEX

15 +2

CON

12 +1

INT

11 0

WIS

10 0

CHA

8 -1

Skills Perception +2, Stealth +4

Damage Resistances bludgeoning, piercing, and slashing from nonmagical attacks that aren't silvered

Senses darkvision (Rat form only), passive Perception 12

Languages Common (can't speak in rat form)

Challenge 2

Keen Smell. The wererat has advantage on Wisdom (Perception) checks that rely on smell.
Shapechanger. The wererat 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.

Actions

Multiattack (Humanoid or Hybrid Form Only). The wererat makes two attacks, only one of which can be a bite.
Bite (Rat or Hybrid Form Only). Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 ( 1d4+2 ) piercing damage. If the target is a humanoid, it must succeed on a DC 11 Constitution saving throw or be cursed with wererat lycanthropy.
Shortsword (Humanoid or Hybrid Form Only). Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 ( 1d6+2 ) piercing damage.
Hand Crossbow (Humanoid or Hybrid Form Only). Ranged Weapon Attack: +4 to hit, range 30/120 ft., one target. Hit: 5 ( 1d6+2 ) piercing damage.