Killer (5e Subclass)
From D&D Wiki
Killers are fighters who uses necromantic energy to empower their strikes and raise their foes as undead servants.
When you choose this archetype you may once per turn when you hit an enemy with an attack you may choose to deal 1d8 extra necrotic damage. The damage increases to 2d8 when you reach 5th level, 3d8 when you reach 11th level and to 4d8 when you reach level 17
At 7th level whenever you use the necromantic strike to kill a living creature that are medium or small you may animate it as a zombie.
Death for life
When you reach 10th level you regain HP equal to half the necrotic damage you deal whenever you use the necromantic strike
When you reach 15th level choose two of the following creature types: Abberations, Beasts, celestials, dragons, elementals, fey, fiends, giants, monstrosities, or oozes. Alternatively you can select two types of humanoids and one creature type or you could choose four types of humanoids (such as Orcs and goblins). Your necromantic strike allways deal maximized damage to the chosen types.
At 18 level you learn the animate dead spell and you can cast it at will as a 5th level spell. Additionally you learn to draw on the energy of the dead. Whenever you take damage you may choose to transfer that damage to a zombie or skeleton you control.