From The Heroes of Might and Magic III wiki

Class	Earth Magic
Basic cost	20
Duration	Combat/Permanent
Level	4th

Ressurects dead units in target allied stack. Doesn't work on undead, elemental, a golem, Stone/Obsidian Gargoyle or War Machines.

Level	Effect
None	Resurrects (Spell Power * 50 +40) health until end of battle
Basic	Cost reduced by 4
Advanced	Permanently resurrects (Spell Power * 50 +80) health
Expert	Permanently resurrects (Spell Power * 50 +160) health

[edit] Heroes that specialize in Resurrection

• Jeddite the Warlock
• Alamar the Warlock

[edit] Units capable of casting Resurrection

• Archangels