Q:
Lore question
A:
Abaddon. It’s stated that the Cauldron of Cataclysm used magic even older than the Six Gods, however, so it may be a relic from the last time the Dragons walked Tyria.
As Zazares said, it was part of Abaddon’s master plan but is in fact far older then him.
Judging by the fact that Zhaitan had planned to use one if I recall correctly, it’s safe to assume it is at least as old as last awakening.