The problem is that this magus [i]is[/i] out of place. Magus isn't the deus ex machina one might expect it to be, there is a limit to it and I wrote it as such just so nobody could use the 'my power is to have [i]all of the powers[/i]' card. That limit is that it's a science, a complicated system of metaphysics, mathematics and ancient linguistics that take years to master. It's not just information that can be borrowed, it's such an intense field of study that the only magus you rightly understand is your own. Even if, hypothetically, somebody could change their magus, they couldn't also appropriate the knowledge of how to use it because that's maybe a decade of fervent study, the implications of stealing knowledge like that would make this a skill already far more overpowered than it is.