You have a Black Magic aka Necromancer as well as a Demonic skill tree. You can summon skeletons (up to 2 melee, 1 archer, 1 mage) out of thin air additionally summon up to 5 zombies from corpses (highest upgrade as Aura automatically every second provided there are fresh corpses), summon a demon and flesh corpse golem. So all in all up to 11 summons at a time, which is basically half an army all by yourself.
Additionally there's the expected skills like corpse explosion, life leech, death fog and some debuffs like slower movement, attack speed, resistances which work well with a high level skill which summons a scythe that deals more damage for each debuff on the enemy.
If you are looking for the "classic" Necromancer experience I think Spellforce meets the criteria quite well.