Mythic changes
The two changes are:
- Necrotic Embrace hits two people at the same time instead of just one.
- Every time somebody gets Alone in the Darkness debuff a shadowy copy of Varimathras will spawn in that location.
Recommended strategy is using three tanks. Two do whatever they do in heroic, and third is helping with Necrotic Embrace. Third tank is preferably a warrior or a monk for instant movement out of raid. Typical four healers, but a disc priest with Clarity of Will is recommended for handling Misery and even alt or offspec can do it in a pinch. Without disc priest healers need to use whatever absorption tricks they have, probably best would be trinkets that give shield on demand.
Whole fight revolves around proper movement and stacking around few markers, and switching to the shadowy add when it spawns. Positions are slightly different from normal and heroic modes again.
Raid stacks on red and blue markers, switching between the two just like in normal and heroic modes.
When raid stacks on red side and two people get Necrotic Embrace both of them and the third tank assigned to soak NE’s move to blue marker together, then the two with NE debuff move to white and purple markers alone to explode with the NE. If people are positioned right none of the three will get Alone in the Darkness and the tank has now 2 stacks of NE. Then the two people who originally had NE go back to the raid together and the offtank will spawn the shadow add under him on blue marker.
Raid must switch to the add and nuke it down in 3 seconds (it has 30M health and it should be possible easily with instant nukes). While the raid nukes the add the tank with two NE debuffs runs out of the raid to explode, gets Alone in the Darkness and Misery which healers need to take care of.
Exactly same thing happens when raid is stacking on blue marker. The two NE victims + offtank move to red together, NE’s move to green and yellow, drop their debuff there to the tank, two people return, tank goes out to explode and spawns add on red, raid nukes add.
That is whole fight for about five minutes from pull to loot.