Necromancy

From Heroes of Might and Magic: Olden Era Official Wiki
Skill Subskills
Basic Necromancy
4.0% of defeated enemies’ HP is converted into allied Undead HP after each victory. This adds new units to all existing Undead stacks and doesn’t create new ones.
Advanced Necromancy
6.0% of defeated enemies’ HP is converted into allied Undead HP after each victory. This adds new units to all existing Undead stacks and doesn’t create new ones.
Gravesoil
Necropolis creatures deal +10% and take –10% Damage on Native Terrain.
Soul Harvest
Restores 4 mana after a battle victory.
Lord of the Dead
+2.0% to Necromancy power.
Expert Necromancy
8.0% of defeated enemies’ HP is converted into allied Undead HP after each victory. This adds new units to all existing Undead stacks and doesn’t create new ones.
Soul Reaper
–1 to enemy Morale and Luck in battle.
Eternal Service
Grants a new ability. It restores HP to the target and can revive fallen units.