There was a majestic dark golden orb in the deepest part of Avernus. That was its origin, which contained dozens of souls belonging to the Archdevils that had fused with it.
Each Archdevils' True Soul occupied a determined zone, with those at Rank 7 in the periphery, the few at Rank 8 close to the core, and the one at Rank 9 right in the origin's center.
Those True Souls were hibernating and would not wake up unless something extreme happened, like a new Devil trying to rise into Rank 7 or a challenge. Even then, that would only involve those at the periphery, and the Rank 8 Archdevils do not bother with it, much less the one at the origin's center.
Zurtur's True Soul had not woken up in millions of years, as there had not been an event that could affect him. However, all that changed today as a shadowy figure emerged from the soul!
Avernus' origin began to tremble as it detected a foreign presence, waking all the Archdevils' True Souls.