As
@0KuroShii already pointed out, アンドレアルフス is supposed to be Andrealphus, the 65th of the 72 demons in the Ars Goetia, one of the five books of The Lesser Key of Solomon. It is described as a great Marquis with the appearance of a Peacock who raises great noises and teaches cunning in astronomy, and when in human form also teaches geometry in a perfect manner. He is also described as ruling over thirty legions and as having the ability to turn any man into a bird.
Also, it is a huge disservice to translate 尊き別離 as simply "sir". 尊き別離のアンドレアルフス should have been translated as "Andrealphus of Revered Separation".
Also, he said "—Fall," not "Die."