How to exploit it?
hmmmmmmmm
Necromancers, undead, liches, or thngs that revive like a pheonix or things invulnerable to normal biological death like golems...
Unless the wording does not refer to activation requirements, and any fatal wound triggers the skill, in which case basic hospital care can help him survive a technically lethal stab wound, for example.
Or can I abuse it via the fact natural age kills us all, meaning that the skill actually auto triggers without immediate death?
AHAA!!!!
It never explicitly says HE dies to activate the skill. If he gave out purell and his opponent washed their hands, he gets a skill from an opponent KILLING germs.
I would start a hand sanitizer company then.