Watch out raiders, one of Mythic Sarkareth's timers has changed and makes things slightly harder in Patch 10.2!
During Phase 3, Mythic Sarkareth has an additional cleave (Void Slash) directly after the second hide (Scouring Eternity). If you're not prepared for it, Sarkareth can just cleave your entire raid unexpectedly!
Make sure that directly after the hide, the active tank turns the boss around so the raid doesn't get cleaved. In addition, due to this extra Void Slash, the raid will take extra damage when the Tank needs to go down due to Destabilize. None of his other timers appear to have changed.