They were sent on missions to capture cities, collect followers, explore labyrinths, Seeking Sublimity. One year passed and Damian's patience decayed and hate towards Angels and gods grew more and more as time passed.
Gods of Integrity weren't bad people. In fact, they were striving for the welfare of their followers yet, they had a sense of rivalry towards Corrupted gods. Corrupted gods indulged in evil things while Integrity gods protected and while building their forces. And the blunt reason was to fight Corrupted gods.
Outsiders hoped for freedom which they didn't get. Times of clan wars and missions had surely increased their levels but that did not readily give them freedom. They were in the clutch of Gods as puppets.
This cyclic suffering of Outsiders was happening over a century and beyond, far before his Transmigration.
Damian complied with the Gods, He kneeled before them, prayed for answers, He was practically begging every day.