His true voice is piercing to the human ear and looking on his true visage will burn a human's eyes from their head, as [[Pamela Barnes]] found when she tried to summon him in a seance. When he mets Dean he is inside the body of a man he says "prayed for it".
==Castiel in occult lore==According to [http://www.ascension-research.org/davidson.html "Dictionary of Angels: Including the Fallen Angels"], Castiel is a an Angel Of Thursday Angel in the occult lore. This may be a reference to the fact that Supernatural airs on a Thursday night on The CW.
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