The 4 Grand Duke Clans of Void Palace also lived in the main palace…to an extent.
They had branches in the main palace that had direct planar connections to their main residences that were further out in the Brightmoon Principality where Void Palace was.
But in reality, they weren't really branches. They were just parts of the Grand Duke Estates that had been separated from their main residences by displacement phenomena, but really still existed in the main residences.
It was complicated because space was twisted in a way that reality didn't seem to allow, but this was what could be achieved when so many spatial practitioners were brought together and given an environment where they could thrive.
Anyway, Damien made it to the Hugo Clan's branch relatively easily. He thought he'd have to find the main residence after doing so, but outside his expectations, Brontus was already there, as if waiting for him to arrive.