Parasite

Parasite was an early skill for the Witch Doctor in Diablo III alpha.

It would cast a parasite at an enemy dealing X damage per second. If a target died while under the effects of the spell, a Zombie Dog would emerge from its corpse.

The spell was cut early on, but some skills (like Circle of Life) have a similar mechanic of turning slain enemies into Zombie Dogs.

Trivia

 * Parasite, in a similar way (damage over time and creating minions when target dies), is a recurring spell in Warcraft universe.