Dhuum

From Guild Wars Wiki

Dhuum was the god of death before Grenth and was believed destroyed in the Chaos Plains in the Underworld. Dhuum was, according to Reaper of the Chaos Planes, a cruel and unjust god and was thus overthrown by Grenth who took the position as the new god of death. No known depictions of Dhuum have been observed.

Spoiler alert: The following text contains spoilers relating to the story of the Nightfall PvE campaign.

A dialogue by Keeper Zeliss in Nightfall reveals that Dhuum has survived in some form and that he and Menzies are aiding Abaddon. Known followers of Dhuum include the Terrorweb Dryders, Tortureweb Dryders, Riders of Dhuum and the Emissaries of Dhuum.