Buff Maw

Unique – Lifeline: If you would take magic damage that would reduce maximum health below 30%, you first gain a shield that absorbs 350 magic damage for 5 seconds (90 second cooldown).

PD Unique – Lifeline: If you would take damage that would reduce maximum health below 30%, you first gain a shield that absorbs 240 − 600 (based on level) damage decaying over 2 seconds (90 second cooldown). You buy maw for the anti burst and it has a magic shield that blocks for less then both steraks and PD and those block both phyiscal and magic damage .