Diseased Giant Rat

Keen Smell. The rat has advantage on Perception checks that rely on smell.

Pack Tactics. The giant rat has advantage on attack rolls against a creature if at least one of the rats allies is within 5 feet of the creature and not incapacitated.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 (1d4+2) piercing damage. Giant rats who dwell in sewers and filth can carry debilitating disease. A creature bitten by a diseased giant rat makes a DC 10 Constitution saving throw or it becomes infected with sewer plague.