Undead Fortitude. If damage reduces the zombie to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 1 hit point instead.

Spellcasting. The priest is a 5st-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 13, +5 to hit ). The priest has the following spells prepared:

Cantrips (at will): Sacred Flame, Toll the Dead, Word of Radiance, Thaumaturgy

1st level (4 slots):  Bane, Inflict Wounds, Guiding Bolt, Ray of Sickness

2nd level (3 slots): Blindness/Deafness, Hold Person

3rd level (2 slots): Animate Dead, Spirit Guardians

Club. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 2 (1d4) bludgeoning damage.