It's literally a living, possibly sentient given the way other characters talk about it, realm, that should also have the strength of all the ghosts in it we're also outright told it can't crossover to any other realm through any means but the realm crystal because it's too strong and vengeful (Yes I've been rewatching possession) Granted I still think the Overlord is stronger but the Preeminent should be brought up more often than not, I'd even say it's probably stronger than Nadakhan with...