Wererat

Medium humanoid (human), lawful evil
Armor Class
12
Hit Points
6d8 + 6 (33)
Speed
walk
30 ft.

STR
10 (+0)
DEX
15 (+2)
CON
12 (+1)
INT
11 (+0)
WIS
10 (+0)
CHA
8 (-1)

Senses darkvision 60 ft. (rat form only), passive Perception 12
Languages Common (can't speak in rat form)
Challenge 2 (450XP)

Damage Immunities
bludgeoning, piercing, and slashing damage from nonmagical weapons that aren't silvered

Special Abilities

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.

Keen Smell

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

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.