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.
Levels
Basic Necromancy
After winning a battle, raises 10% of the strongest enemy stack as friendly Undead of the same tier. This requires Necromantic Energy, which stores up to 3000 and refills each week.
Advanced Necromancy
After winning a battle, raises 15% of the strongest enemy stack as friendly Undead of the same tier. This requires Necromantic Energy, which stores up to 4000 and refills each week.
Expert Necromancy
After winning a battle, raises 20% of the strongest enemy stack as friendly Undead of the same tier. This requires Necromantic Energy, which stores up to 5000 and refills each week.
Eternal Service
Grants a new ability. It restores HP to the target friendly Undead and can revive fallen units.
Artifact Effects
Holy Sigil of Roph —
Epic Relic
While worn, grants all unlearned Subskills of the following Skills: Righteousness, Necromancy, Murmuring, Triumvirate’s Strength, Abyssal Communion, Summon Swarm.

