I tested one of these on the live server this week. Testing confirmed a 30 save prevents the death, and between 1% and 5% proc rate. So it appears it is the same old 30 DC Slay Living - which is pretty useless at level 28+ (roughly 1 in 400 chance to slay something that isn't death warded).
This augment should be upgraded with a much higher DC. Maybe at 100 DC it might be worth consideration for players, while still fairly weak. The same goes for the level 28+ weapons that have Slay Living on them (Legendary Wave of Sorrow and Legendary Wave of Despair) which have a very weak effect on them but cost a lot to acquire.