Originally Posted by
cruxxy
You can definitely Disc heal LK without regemming for regen. You just have to be judicious with your throughput.
In the first phase, you should be very conservative. Shield the tanks, penance the Shambling tank to keep inspiration up, PoM, that's about it. You want to enter P3 with full mana and fiend/HoH still available.
P3 is your big mana dump. I don't quite understand the mechanism of Infest; that is, the first tick is less than my shields and it shouldn't tick twice if they stay at full health, but I have no problem getting Rapture procs. I always focus my shields on healers/range first. The melee are more likely to be clumped together and therefore generally well covered by various AOE heals.
I usually pop fiend (and sometimes HoH depending on how my mana is doing) during the 3rd wave of Val'kyrs and the second P2 with near full mana.
Then P4, obviously you need a shield+penance ready for harvest soul. Also, I spam shield the melee as they are most likely to get burst by the viles. If needed, I pop a mana pot here.