Abyssal Blessing. Abbot Grosso gains 15 temporary hit points when he reduces a hostile creature that is not undead to 0 hit points.

Spellcasting. Grosso is a 10th-level spellcaster. His spellcasting ability is Wisdom (spell save DC 14, +6 to hit with spell attacks). Grosso has following Cleric spells prepared:

Cantrips (at will): guidance, light, resistance, sacred flame, thaumaturgy

1st level (4 slots): bane, cure wounds, detect magic, detect poison and disease

2nd level (3 slots): augury, enthrall, hold person, spiritual weapon

3rd level (3 slots): animate dead, bestow curse

4th level (3 slots): divination, ice storm

5th level (2 slots): contagion, scrying

Unholy Strike. Once on each of Grosso’s turns when he hits a creature with a weapon attack, he can cause the attack to deal an extra 13 (3d8) necrotic damage to the target. 

+2 Sickle. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (2d4 + 2) slashing damage.