Mark of Subversion

Description
For 4...9 seconds, the next time target foe casts a Spell that targets an ally, the Spell fails and you steal up to 10...76 Health from that foe.

Acquisition
Skill Quests: Skill Trainers:
 * None
 * Marna (Ice Tooth Cave)
 * Firstwatch Sergio (Lion's Arch)
 * Dakk (Ember Light Camp)