Doomwalker is a world-boss from The Burning Crusade expansion. It has the potential to drop one of the following items, all of which are Bind On Equip and iLvl 120 with a required minimum level of 70 in order to equip:
Doomwalker can only be killed once a week because the monster will only respawn after a server restart/maintenance. The world boss tends to be heavily farmed on most realms - especially exacerbated by CRZ - so if a player is interested in killing it then he/she ought to park his/her character near Black Temple before maintenance/restart.
Killed today at around 6.20 realm time, dropped Gilded Trousers of Benediction and Ethereum Nexus-Reaver and around 50 gold :)