1.http://www.db.pandawow.me?spell=114556/purgatory (tallent) 
2.The shield does NOT proc anymore 
3.How it must work: When taking lethal DMG a gray health shield should pop up for 3 seconds at 1 hp and if the gray health is healed the dk does not die. 
4.It used to work before the Changelog #9 - 04.11.15 
5. Realm x100 
6. This shield has saved me many times in raids as a tank and its like a second life for the death knight