I don't know, I'm not a fan of these attempts at fake Olde English. I'd prefer if you used just typesetting to show noble speech, rather than immersion-breaking incorrect old English.^^ Just my two cents.
Actually light is "to illumination" aka. "turn to invisibility" tho.. Dark is mostly related to curses and space magic.. and to as a dark spirit to change the spirit wielder to invisible is bit of an illogical move..