Swarm of Rats

5e compatible shield

Medium swarm of Tiny beasts, unaligned

Armor Class 10
Hit Points 24 (7d8 - 7)
Speed 30 ft.

STR DEX CON INT WIS CHA
9 (-1) 11 (+0) 9 (-1) 2 (-4) 10 (+0) 3 (-4)

Saving Throws 
Skills 
Damage Resistances bludgeoning, piercing, slashing
Damage Immunities 
Condition Immunities charmed, frightened, grappled, paralyzed, petrified, prone, restrained, stunned
Senses darkvision 30 ft., passive Perception 10
Languages --
Challenge 44930 (50 XP)

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

Swarm. The swarm can occupy another creature’s space and vice versa, and the swarm can move through any opening large enough for a Tiny rat. The swarm can’t regain hit points or gain temporary hit points.

Actions

Bites. Melee Weapon Attack: +2 to hit, reach 0 ft., one target in the swarm’s space. Hit: 7 (2d6) piercing damage, or 3 (1d6) piercing damage if the swarm has half of its hit points or fewer.