The Might of Stormwind buff was introduced in SoD to be a direct 1:1 to the Horde's Warchief's Blessing buff, since prior to Season of Discovery, the Horde only had access to this Haste and Health world buff. Similar to the Horde getting their buff, Alliance players must complete End of the Dark Horde by looting the Head of Rend Blackhand off of Warchief Rend Blackhand in Upper Blackrock Spire. As a reminder, world buffs are only accessible in the open world and dungeons, and not in raid instances in WoW: Forever
