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Seb-wejem
I've only seen the movie, but from watching it that guy was totally a fraud. It was like he failed to learn any spell other than enchantments which is what he used to mind wipe and steal the credit of others.I think Gilderoy was just a fraud. I dont know how they could have telegraphed that any better. I dont remember him teaching his class any spells at all.
I'd describe him as an enchanter specialist in 2e terms since they had a bonus to learn enchantment spells and penalties to learn any others that weren't prohibited. I'd probably give him a fairly low intelligence as well, maybe not 9 but probably no more than a 13.