Heroic Sylvanas Windrunner Boost
Sylvanas Windrunner is the final boss of the Sanctum of Domination raid, released in Patch 9.1, Chains of Domination. Defeating Heroic Sylvanas Windrunner, you will awarded with the achievement [Ahead of the Curve: Sylvanas Windrunner]. Heroic Sylvanas Windrunner is guaranteed to drop one Shard of Domination, as well as [Stygian Embers], which can be used to upgrade Shards of Domination. Shards of Domination are used to increase your characters power in The Maw, Torghast, and the Sanctum of Domination raid via the Domination Shard Set Bonuses.
Hunters that defeat Heroic Sylvanas Windrunner have a chance at looting the Legendary Bow [Rae'shalare, Death's Whisper].
The only loot you are guaranteed to receive are items that you personally loot from the boss.