Mark of Subversion

Description
For 4...10 seconds, the next time target foe casts a Spell that targets an ally, the spell fails and you steal 10...87 Health from that foe.

Acquisition
Skill Quests: Skill Trainers: Signet of Capture:
 * None
 * Marna (Ice Tooth Cave)
 * Firstwatch Sergio (Lion's Arch)
 * Dakk (Ember Light Camp)
 * ... (more) to be added ...