Glaive of the Fallen

The Glaive of the Fallen is one of the Legion Invasion-specific weapons and will only be available during the event before the launch of World of Warcraft: Legion. Unlike the other weapons, the glaive is Bind on Account by virtue of demon hunters not necessarily being available to players.

Source
This item is sold by Captive Wyrmtongue in Stormwind, Orgrimmar, and all six invasion zones for. It also occasionally can be found inside the Large Legion Chests awarded for completing stage 4 of a Legion Invasion.

Can be upgraded, up to 5 times, using the Coalesced Fel.