The Creature was annoyed that Ciprian hadn't yet adjusted to their new state of closeness. Instead of being useful, his creator either slept or paced in delirious circles around the hovel of his son's former home.
His daughter's heart had turned to dust after the failed sacrifice, and now Ciprian's white robes were smeared with grey from where he'd pressed it to his chest as it disintegrated. Instead of the fear the Creature needed to fully materialize, all Ciprian fed him was doubt.
The Creature waited in the shadows, wishing there was a way to kill the man without hurting himself. His creator wasn't as steadfast as he once was.
He could sense his remaining brother-selves through their connection, some of them trapped in the dying priests they inhabited, and a few remaining in the Orderly plane. As soon as Ciprian gave him the fear he needed, the Creature would find them and tell them they should follow only him from now on.