Zek’voz, Herald of N’zoth Detailed Strategy Guide (incl Mythic) for Healers
If a player gets eyebeam during the surging darkness phase, you want to stay into the black part of the rolling darkness and until eyebeam fires, then you move into the safe zone this will prevent anyone from nuking anybody else with the beam.
When surging darkness happens, you can use AOE healing like healing rain, simply place at the cover two zones. The surging darkness will always spawn either inner or outer and then middle. Then inner or outer and then middle again. When in the outer or inner ring, you can place AOE healing to straddle into the middle.
You can negate the Orb of Corruption problems by having a player bounce it to the wall. They just need to make sure they are facing directly to the wall when they do it.
Using a gateway for players to move out with Roiling Deceit makes it so the puddles are in the area by the door. However, if players are slow to move out, they can drop the puddle on the other end of the gateway and then next players to take it will be killed unless the warlock moves the gateway to a better position.
During the last phase, have a CD ready in case multiple players get MCd and are feared. You can use tremor totem, mass dispel and revival to remove the fear, which lasts for 8 seconds.
You should dispel both Psionic Blast and Void Wail from affected players.