Giant Rat (Diseased)

The Giant Rat (Diseased) has advantage on Wisdom (Perception) checks that rely on smell.

The Giant Rat (Diseased) has advantage on an attack roll against a creature if at least one of the Giant Rat (Diseased)'s allies is within 5 feet of the creature and the ally isn't incapacitated.

+0 to hit, range 5 ft. Hit: 0 (1d4 - 2) piercing damage. If the target is a creature, it must succeed on a saving throw or contract a disease. Until the disease is cured, the target can't regain hit points except by magical means, and the target's hit point maximum decreases by 3 (1d6) every 24 hours. If the target's hit point maximum drops to 0 as a result of this disease, the target dies.