Plague Monk

Sunlight Sensitivity. While in sunlight, the skaven has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.

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

Pack Tactics: The skaven has advantage on an attack roll against a creature if at least one of its allies is within 5 feet of the creature and the ally isn’t incapacitated.

Tough:  If damage reduces the plague monk to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is from a critical hit. On a success, the plague monk drops to 1 hit point instead.

Pestilent: Devotees of Clan Pestilens are immune to the effects of poison and disease, though they remain capable of carrying such afflictions.

Multiattack: The plague monk makes two attacks with its fetid blades.

Fetid Blades. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 2) piercing damage, and the target must make a DC 10 Constitution saving throw, taking 5 (2d4) poison damage on a failed save, or half as much damage on a successful one.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 2) piercing damage.