It took some time, but Sebastian eventually got used to it.
The transition from the reality of exploring an inheritance ground, hoping of getting some booties only to suddenly be teleported to a domain world where he was sentenced to life imprisonment was hard to stomach for him.
The Dungeon of Souls where the massive war between the Killer Whale Empire and the Necromancy King Empire happened was chaotic, but the Domain World of the Ocean King was a lot more chaotic.
This was a world that was ruled by Domain Beasts. These beasts were mostly brainless, but they were hellishly powerful opponents to face in battle.
They mostly moved in battle formations which were one of the few intellectual properties that they inherited from their progenitor.