Necromancy
From Heroes of Might and Magic: Olden Era Official Wiki
Necromancy is the unique faction skill of the 
Necropolis faction, known by default by all Death Knights and Necromancers and unavailable to other hero classes.
It lets the hero raise a portion of defeated enemies as friendly Undead units after winning a battle, helping them recoup battle losses and build up large armies.
| Skill | Subskills | ||||||
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Basic Necromancy After winning a battle, transforms 10% of the strongest enemy stack into friendly Undead of the same tier. This requires Necromantic Energy, which stores up to 1000 and refills each week or when the hero has no stack of that tier in their army. |
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Advanced Necromancy After winning a battle, transforms 15% of the strongest enemy stack into friendly Undead of the same tier. This requires Necromantic Energy, which stores up to 1250 and refills each week or when the hero has no stack of that tier in their army. |
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Gravesoil Friendly Necropolis creatures deal +10% and take –10% Damage on Native Terrain. |
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Soul Harvest Restores 4 mana after a battle victory. |
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Death Herald +500 to the hero's maximum Necromantic Energy. |
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Expert Necromancy After winning a battle, transforms 20% of the strongest enemy stack into friendly Undead of the same tier. This requires Necromantic Energy, which stores up to 1500 and refills each week or when the hero has no stack of that tier in their army. |
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Soul Reaper –1 to enemy Morale and Luck. |
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Eternal Service Grants a new ability. It restores HP to the target and can revive fallen units. |
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Fields of the Dead +50% Necromantic Energy gained wehen the hero has no Undead of the required tier. |
Artifact Effects
Holy Sigil of Roph grants all unlearned Necromancy subskills, as well as those of Righteousness, Murmuring, Summon Swarm, Abyssal Communion and Triumvirate's Strength.
