Small Beast, unaligned
Armor Class 12
Hit Points 7 (2d6)
Speed walk +30
Challenge 1/8
Senses darkvision 60 ft., passive Perception 10
Keen Smell. The rat has advantage on Wisdom (Perception) checks that rely on smell.
Pack Tactics. The rat has advantage on an attack roll against a creature if at least one of the rat's allies is within 5 ft. of the creature and the ally isn't incapacitated.
Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 2) piercing damage.
Source: 5e Core Rules · OGL/Open