Well of Suffering

Description
Exploit target corpse to create a well of suffering at its location. For the next 10...26 seconds, enemies in that area suffer health degeneration of -1..5.

Acquisition
Skill Quests: Skill Trainers: Signet of Capture:
 * Mysterious Message (Druid's Overlook)
 * Tengsao (The Amnoon Oasis)
 * Dakk (Ember Light Camp)
 * ... more to be added ...