It did not take long for the dark keep to be fully constructed, so little time in fact, that many considered that it might be a mirage or illusion of some sort aimed at making them panic, but there was no room for doubt, the massive block of black stone was absolutely real, standing firmly in the south of the realm, the undeads had placed siege weaponry upon the walls, dug deep moats and filled them with water that they had definitely not sourced from the Emerald Realm, festering with countless corpse abomination.
Though, the undeads themselves did not really show themselves much, what looked like regular workers and soldiers never lingered around for more than three hours at a time before being replaced by another, and the only ones that seemed to openly move around were those whose appearance made it obvious that they weren't regular grunts.
"Looks like it's working pretty well, not that there is any reason for it not to work as intended"