Necromantic soul

Having spent so much time around death and undeath, you now can find a careful balance between the two to grant yourself an advantage during combat. You take advantage of the brief moment of the life leeching out of a body to capture it and claim it as your own.

Once per long rest, when you kill a foe within melee range, you may use your bonus action to cast Animate Dead on the corpse. You can only do this on the same turn that the creature is killed. Additionally, as a bonus action, if the minion is in range, you can touch it, killing it and granting you temporary hit points equal to it's current health, to a maximum of your level x2.

This feat also grants access to the Chill Touch Necromancy cantrip.