[quote=@Captain Jenno]
What you came up with is inaccurate, then. Naturally [i]I[/i] know what decides upon an Arcanist's magus, but it hasn't yet been divulged because it's a plot point to come. I can however tell you that there is no inherent link between an Arcanist and a hypothetical vast omnipotent universe. Magus is something specific to Luxas and has an origin point. The long and short of it is that magus is demonic mathematics, it's knowledge from The Nocturne, which itself is a vast unknown. 
What [i]decides[/i] upon an Arcanist's magus is not something that can be appropriated. You've said that the information isn't inherited, just the ability, and that Ibyxx learns through observation, but that's akin to learning how to speak Russian through lipreading without a dictionary: You have all the tools you need to speak [i]English[/i] (and use your [i]own[/i] magus) but the language they're speaking is an entirely different one, the internal processes invisible and the point of reference basically non-existent, the only thing you have to work with is that both of you are definitely speaking [i]some sort[/i] of language. And again, I've made it that way specifically so nobody can use the "every power" model.
[/quote]

Hrm this puts a new spin on it. The new information and analogy makes it more clear that there is no true fundamental/universal formulae and that the patterns are in fact then unique between spell formulations. That is there is no similarity between the methodology in casting one spell and another of similar concept/design. Since there is absolutely no reference point, this makes consistency impossible, and I'd say it's much less of a science than a personal art since if there is no basic premise that all spells can be and are formulated the same way, yet yield varying effects within a given degree of variability unique to the individual, there is no way one Arcanist can aid another arcanist in the study of Magnus as between the two, there is no commonality in language, synthax, grammatical structure, or even alphabet most likely. Thus between both ends now the technique would be baseless. Which brings me back to the drawing board.

Would an illusionist work?