While I'm neither Azure nor Raibys, I think that trying to trace a spell to an "original user" is ridiculously hard, if not impossible, due to the nature of spells themselves being an extension of the entanma's soul, written in that entanma's soul's orguis language! It's like trying to find out who made what branch of an open source program when -- there's so many different versions and after millenia or so of splitting and becoming varied you'll probably not even be able to find 50 of the 20,000 branches!