Some rough thoughts/speculation I came up with, maybe there are some holes and contradictions. The titans were one of my favorite enemy types in GW1 and it would be great to see more titan lore.
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The titans were originally created as constructs designed to kill mursaat by the seers, before humans and their gods arrived. They were in built various forms to blend in with different geographical settings, and they were intended to sweep Tyria and exterminate the mursaat.
The seers had a presence in the Ring of Fire, but the titan production facility was located in the Mists (for secrecy purposes), in a region that would later be known as the Realm of Torment. It was accessed through a portal in the Ring of Fire (Door of Komalie)
For whatever reason, the titans are deemed a failure (rebelled against their creators? perhaps this contributed to the decline of seer civilization) and their production stops, remaining units are sealed away in the Foundry. The Door of Komalie is deactivated.
After Abaddon is thrown into the Realm of Torment, the Forgotten repurpose the Foundry as a prison for Margonites.
Some titans were not sealed away, and persisted hidden in Tyria. Abaddon gains their allegiance by offering to free their kin from the Foundry. He used the titans to influence the charr, who may not have been willing to follow Abaddon directly, since he is a human god.
At some point, Abaddon’s forces overrun the Foundry and seize control, freeing the titans and bringing them to his side.
The Scepter of Orr/Staff of the Mists are control/production/enhancement-related devices for titans, created by the seers.
Part of Khilbron’s role in Abaddon’s plan was to retrieve the Scepter of Orr, for some titan-related purpose. The Sceptor of Orr may not actually control the titans, the titans may have been following Abaddon instead in Prophecies. The Scepter may instead be used for producing titans.
The Scepter of Orr may have fallen into Abaddon’s possession after Khilbron’s death. Perhaps there are two sets of titans, the original set created by the seers, and a second, more demonic-styled set created after Abaddon acquires the Scepter of Orr.
http://wiki.guildwars.com/wiki/The_Cold_Touch_of_the_Past
Abaddon’s minions search for the Staff of the Mists for some titan-related purpose
Abaddon intended to use the Foundry of Failed Creations/Door of Komalie as an entry point for an invasion of Tyria. This plan fails twice:
- Some time before the founding of the White Mantle, Abaddon reactivates the Door of Komalie from the Realm of Torment side, sending some titans across.
- The mursaat constantly monitor the Door, knowing what lies behind it, and they quickly react, pushing back the initial wave of titans.
- The mursaat block the Door of Komalie, unable to shut the portal down completely, but realize that maintaining the seal requires a large supply of souls. This leads them to establish the White Mantle as a front for their soul reaping activities.
- Another invasion is started and quickly stopped at the end of Prophecies.