

The third bonus consumes duration of any Damage over Time effects (not just the Witch Doctor's skills) applied by the Witch Doctor, including the Gem of Efficacious Toxin poisoning.

Haunts released by dying foes will not trigger the first bonus, attempting to find new targets instead. Moreover, only Haunt spirits released by the cast (one, two or three, if Haunting Girdle and / or Resentful Spirits rune is used) can detonate existing Haunts. The second Haunt is consumed in process, though, so when that enemy dies, it will only release one Haunt to find a new target. This only applies to the Witch Doctor's own Haunt, and only to the skill itself. The first bonus works very similarly, except for it deals 3500 seconds of Haunt damage regardless of how many remain, and then refreshes it to full duration. However, even with this limit, this is one of the most damaging set bonuses in game, its potency being doubled when combined with Quetzalcoatl and further doubled when Ring of Emptiness is equipped.

The latter bonus does not consume the entire duration, but instead only converts up to 10000 seconds into instant damage (to prevent abuse of the Creeping Death skill).

Diablo II: Resurrected Review - Pile Of Old Bones
