Derisor is a demon in Mathers’ translation of the Sacred Magic of Abramelin the Mage. This demon is a trickster who can be conjured to assist with illusions and obscure things seemingly making them invisible. Derisor also appears in Mathers’ Clavicula Solomonis. A.G.H.
Belanger, Michelle. The Dictionary of Demon: Names of the Damneds. Llewellen Publications. 2010. ebook.