We previously datamined an unobtainable scythe model way back in Patch 9.1 that was only used by various Maw Necromancer NPCs. Players can finally collect this model as the Howling Echoes polearm will be available in Season 3 as a drop from Amalgam of Souls in Black Rook Hold on Mythic+ difficulty.
Howling Echoes
While this new polearm was not part of the original loot table for Amalgam of Souls, it has been added in Patch 10.2 as part of the Season 3 Mythic+ rewards for Black Rook Hold.