Abaddon

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And so it came to pass that Jadoth, being persecuted by the horrific Forgotten armies, and hounded from his home, did seek refuge among the cooling mists of the Crystal Sea. Untold weeks passed as Jadoth huddled in his sanctuary, with nothing to see save the endless ripples of the boundless ocean.
On the 51st day of his exodus, a frightful sight manifested before Jadoth's eyes: the unmistakable shape of Forgotten warships upon the horizon's shimmering edge.
And prayed Jadoth, "Abaddon! Lord of the Everlasting Depths, Keeper of Secrets, open mine eyes and bestow upon me the knowledge of the Abyss that I might smite mine enemies and send them to the watery depths!"
An unsettling silence swept across the waves. The twilight sky shattered and stars streaked down upon the Forgotten armada. The seas boiled and ruptured, and gave birth to a maelstrom from which not even light could escape, and transforming the sky above into a midnight void.
And thus was magic gifted to Jadoth, chosen of Abaddon, the first of the Margonites.

–Scriptures of Abaddon, 1BE

Abaddon was the 6th God, the God of Water and Secrets. After turning upon the other 5 Gods he was defeated by them and trapped in the Realm of Torment, guarded by the Forgotten.

There Abaddon remained until in 1075 AE when Warmarshal Varesh, heir of Turai Ossa and ruler of Kourna, attempted to release Abaddon from his prison. Abaddon's bonds were weakened and the Heroes of Elona, Cantha and Tyria entered the realm of Torment and managed to destroy him. The former Spearmarshal Kormir, took on Abaddon's power to take his place in the pantheon. Abaddon was defeated, and the world was saved from Nightfall.

Gods of Guild Wars
Human pantheon: Balthazar • Dwayna • Grenth • Kormir • Lyssa • Melandru Previous human gods: Abaddon • Dhuum Demi/false gods: Menzies • The Great Dwarf (?) • The Great Destroyer • Mursaat • Titans Norn spirits: Bear Spirit • Owl Spirit • Ox Spirit • Raven Spirit • Wolf Spirit • Wurm Spirit