The LFR version of Yor'sahj the Unsleeping.
Ooze priority on it is the favored P > Y > Black, though some raids may opt for Y > P > Black if they think their healers will behave with a Blue/Purple combination :)
Seemed like the most important one to get up, and quickly. >_>
XCOM2 Tips and a Strategy Game Question
3 days ago