False Aura

M122
==familiarity==
mentions "The chosen False Aura must be familiar to the caster"
example:
:could not put a False Aura of Golem on a statue unless he knew the Golem spell
This is one area where Ritual Magery would excel, since you in theory know ALL spells and could emulate ANY aura.
Maybe one balancing mechanism could be to use a similar rule as Counterspell where your skill is the lesser of the two skills.
==comparison==
Identify Magic isn't so rigid, you can identify a spell even if you "heard of" it, without "knowing" it.
Statistically that needs representation. See that article for exploration.
category:spells