Warning: The following text contains spoilers relating to the plot of Nightfall Campaign.
Abaddon is a dark fallen god that was outcast by the Gods of Tyria long ago and exiled to the Realm of Torment. He was formerly the God of Water and Knowledge and known to the Order of the Whispers as the God of Secrets.
The Casting Out of Abaddon
Abaddon was formerly the God of Water and Knowledge. When the gods gave the sentient races of Tyria the gift of magic, it was Abaddon who represented the gods and handled the actual distribution. However, Abaddon gave out this gift a little too freely and indiscriminately, which fueled the greed that caused the sentient races to abuse it and wage massive wars against each other.
King Doric went to the land of Arah and begged the other gods to bring peace to the world. Against the opposition of Abaddon, the other five gods created the Bloodstones to split up the four schools of magic, which would suppress its abuse.
Abaddon was angered by this and he gathered his strongest followers, the demon Margonites, to assault the weak spot of the Rift so he could overthrow the other five gods. Although Abaddon was strong enough to defeat the joint forces of two gods, he still could not withstand the power of all five gods united. In the end he was defeated and imprisoned in the Realm of Torment, never to interfere with worldly matters again. The site of that great battle is now known as the the Mouth of Torment.
After the war, the five gods erased all mention of Abaddon and his deeds from monuments and historical records. Curiously, there is still a location named Abaddon's Mouth and a copy of the Scriptures of Abaddon remaining in existence. The only logical reason for that is that Abaddon's followers had managed to hide some of their God's records away from the five gods.
The Scriptures of Abaddon
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
Another section of the Scriptures is revealed in the Guild Wars Nightfall manual:
- The Day shall come when the Lord of Secrets
- Will be freed of his Tormented Prison
- When the other gods will quail before his power
- And Night will fall on the living world
- - Scriptures of Abaddon
In the final mission of the Nightfall campaign, Abaddon is defeated, and begins to collapse. Kormir, using the gift granted to her by the avatars, absorbs his power and knowledge and becomes the Goddess of Truth.
- "Abaddon is dead. And I assure you, Grenth will not make the mistake that the other gods did. We will not hear from Abaddon again in this lifetime... or the next."
However, considering Dhuum's current status, this statement is suspect.
- In the Nightfall campaign, Spearmarshal Kormir suspects that Varesh Ossa and General Kahyet, Varesh's respected mentor and loyal officer, are worshippers of this deity and are trying to bring about its return.
- It also seems that his forces (along with the forces of Dhuum and Menzies) were behind the trouble at the Dragon Festival and the Ruins of the Tombs of the Primeval Kings as a way to invade Tyria and Cantha.
- According to the Margonite Apostate, Abaddon attained his power by deposing an unnamed earlier god.
- A mission in Tyria is named after Abaddon. In Abaddon's Mouth, you try to reach the Door of Komalie.
- During the Gate of Madness mission, you discover that the antagonists of both Prophecies (Undead Lich) and Factions (Shiro) are worshipers of Abaddon.
- Revelation 9:11 states, "They had as king over them the angel of the Abyss, whose name in Hebrew is [Abaddon], and in Greek, [Apollyon]." For more information see Abaddon at Wikipedia.
- If you come close enough to his mouth, you may end up stuck inside him.
- Abaddon's appearance is an homage to the disembodied-head-and-hands style of boss, which appears in numerous video games.
- Using the /dance emote before engaging Abaddon will cause him do a little dance of his own.
- To trigger, have all players use the emote while standing on the bridge (or nearby) in Abaddon's Gate (mission) before engaging the end-game boss.
- His dance includes a "raise the roof" move, the fingers-across-the-eyes move from the male warrior's dance, and the "rock on" sign from the necromancer dance.
- His dance ends with slaying your entire party, along with the message: "You've been served".
- The video can be seen here.