Detonating Siphon is a Necromancer Class Skill, found in the Grave Lord Skill Line.
Base Skill: Shocking Siphon
|Violently drain the last spark of life from a corpse, dealing 4620 Disease Damage over 20 seconds to all enemies around the corpse and between you and the corpse. When the siphon ends it causes the corpse to explode, dealing an additional 1799 Disease Damage to all enemies around the corpse.While slotted, your damage done is increased by 3%.|
Detonating Siphon is a morph of the Shocking Siphon base skill. The other morph is Mystic Siphon.