Divine Eminence. As a bonus action, the priest can expend a spell slot to cause its melee weapon attacks to magically deal an extra 10 (3d6) necrotic damage to a target on a hit. This benefit lasts until the end of the turn. If the priest expends a spell slot of 2nd level or higher, the extra damage increases by 1d6 for each level above 1st.

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 5th-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 11, +3 to hit with spell attacks). The priest has the following cleric spells prepared:

Cantrips (at will): chill touch, thaumaturgy, toll the dead

1st level (4 slots): bane, guiding bolt, inflict wounds

2nd level (3 slots): blindness/deafness, spiritual weapon

3rd level (2 slots): dispel magic, spirit shroud

Mace. Melee Weapon Attack: +2 to hit, reach 5 ft., one target. Hit: 3 (1d6) bludgeoning damage.