"None." Sadly, Castiel resigned to his own uncertainty for a moment. His waining powers shook his conviction and faith to the core. Without the full strength of the Grace of Heaven, he was losing much of his strength and power. All too frequently, he wondered what would happen should he lose all touch with his angelic powers. He wondered if he would be of any use at all.
What he could do was impart knowledge. Even if he lost all of his power, he still retained his knowledge of things more ancient than humanity. "We should prepare for anyone to be behind this."