Last night, Shroud's raid team took down mythic Sisters of the Moon, giving us our fourth mythic kill in the Tomb of Sargeras.
The fight itself is not all that different from heroic, but managing debuffs is key. On mythic, we now take damage and gain a stacking debuff whenever someone crosses between light and dark. Too many stacks on the raid and it's almost a guaranteed wipe.
We initially tried to deal with these stacks by having six stationary groups for when the floor was transitioning, but that did not work as well as we had hoped. On our next raid day, we swapped to four groups which worked beautifully, provided we all watched where we stood and didn't accidentally trigger additional stacks, especially when dropping moon burn.
Once that was under control, we needed to learn the rest of the fight. One of the biggest issues we had during progression was simply avoiding glaives, which we generally dealt with by moving the boss to a wall and then moving back to the center.
Lunar Beacons in the last phase were another issue, and one that we still need to improve upon in the future. The last phase is very hectic and on some attempts, we ended up with beacons in bad spots.
All of this aside, we got ourselves the kill, which is the most important thing. Next, we're moving on to the Desolate Host, and our limited attempts have already given us a good feel for the fight and we hope to have a kill soon.
Congratulations to everyone on a well-earned (and, as you'll see in the video, quite ugly) kill!