Wolfe spread the [Necrosis] spell over the area, and overlaid the undead consciousness of the skeletons in the room.
The hosts of their perverse little game show realized quickly that something was wrong, but they had no idea what it was. None of them had ever experienced a spell like what Wolfe was casting, as the denizens of the lowest planes didn't go to the underworld, they were trapped here for eternity.
So, when Wolfe cast Necrosis on them, and offered their souls a link to the underworld, a chance to escape their eternal torment, there was no resistance at all from the undead army.
In seconds, the hold that the spell had on them was broken, and their allegiance had been converted to Wolfe. The creatures in the distance were enraged, unable to understand how their monsters had been stolen, but their viewing spell was clearly showing them the scene of the giant bone dragon putting his head down for Wolfe to pat him.