Enter Unstable Anomaly...
This effectively gives me 45% more life - so I just sit there take it and purposefully go below health knowing that I can basically die once a minute.
This allows me to-
Sit in molten pools and let the explosions hit me
Hit Reflect packs even when I'm almost to 0 health
Take Azmodans fireball like a champ
What I was using before
Critical Mass - I was hoping that if I ever lost archon (by dying) I could make up some time this way. Now that I never die (because of unstable anomaly) this doesn't really make sense.