Arkinslize
The efforts and genius to create a world like this amaze me more and more. Before reading Paths of the Oracle I thought that only astral-type worlds had a large level of truth but now I can't find anything that surpasses the magnitude of the Mirror universe.
a magnetar or a pulsar might have been a better choice, afaik harvesting energy directly from a singularity would be folly. you could of course harvest energy from the accretion disk of an ultramassive black hole that has a mass of over 60 billion times that of our sun. black holes of this size though are theoretical due to star formation occurring in the disk. I'm not sure how large the the planet ship is, so perhaps it can fit one or several BHs the same size as TON 618 and larger.