Some hotfixes have been pushed to Patch 9.2 which has some minor changes to bosses in Sepulcher of the First Ones, and a nerf to a PvP trinket.
Sepulcher of the First Ones Raid Tuning Prototype PantheonThe Protoype Pantheon now has a Berserk effect if they ever resurrect due to the Heroic/Mythic mechanic Complete Reconstruction, giving them 500% damage done, 100% haste and 100% movement speed. If a boss resurrects it's almost certainly a wipe now! This change may have been made in response to a «bug» which allowed 3 of the bosses to die after one had already resurrected, allowing players to kill the final solo boss from 100% to 0% with almost no mechanics.
If a member of the Prototype Pantheon is defeated, they initiate a repair for 100% of their maximum health over 20 sec. This cast is interrupted when all members of the Pantheon are defeated simultaneously. Effect #3 NEW Effect #3 Apply Aura: Mod Damage Done % Value: 500 NEW Effect #4 Apply Aura: Decrease Attack Speed % Modifies Damage/Healing Done Value: 100 NEW Effect #5 Apply Aura: Increase Run Speed % Value: 100 Xy'moxXy'mox's Hyperlight Sparknova had it's ranged slightly reduced to make it easier to spread.
Xy'mox creates a hyperlight spark that jumps between all players, inflicting 13490 Arcane damage instantly and 13490 Arcane damage every 2 sec for 26 sec to all players within 32.5 yds. This effect stacks. Cosmic Gladiator's ResonatorThe new PvP trinket Cosmic Gladiator's Resonator had its damage nerfed slightly.
Throw the cosmic resonator which explodes after 4 sec, dealing 101718321 Cosmic damage split between all nearby enemies. Damage is increased for each enemy struck, up to 5 enemies. Read more on wowhead.com