BoM/TWS Message Forum

I'd place that in the same place as the spells beyond the Chameleon set - there's evidence that may be true, but it isn't as consistent* as the other content. Also: note that it's strongly implied but not said explicitly, which also helps making it of "questionable" canonicity.

I thought about mentioning that as well, given that part of that strong impression comes from those chapters where Will gets golemized, but I declined out of lack of concrete evidence. (For example, given the metaphysics of the story, it could easily be a copy of the author's Anima.) However, anything at that point would be definitely a complex sigil without explanations.

*I use "consistency" in terms of how many times it appears on the Interactive, rather than whether it remains the same each time it's mentioned. You wouldn't consider the Persona spell as non-canon because it's integral to the story, for example. Since it's very rare that stories reach a point where the Libra gets a deep exploration, it's hard to make those spells consistent.