Plague Priest

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 priest 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 priest 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.

Spellcasting: The Plague Priest is a 5th level caster. It’s spellcasting ability is Wisdom (spell save DC 13, +5 to hit with spell attacks). It knows the following spells:

• Cantrips (at-will): Infestation, Poison Spray
• 1st level (4 slots): Detect Poison and Disease, Ray of Sickness
• 2nd level (3 slots): Blindness/Deafness, Ray of Enfeeblement
• 3rd level (2 slots): Stinking Cloud, Blessed with Filth (Crusader's Mantle - Poison Damage)

Multiattack: The plague priest makes two attacks with its pestilent spear.

Pestilent Spear. Melee Weapon Attack: +4 to hit, reach 10 ft., one target. Hit: 6 (1d8 + 2) piercing damage, and the target must make a DC 13 CON 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.

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