I don't think enchantments would work long anyway, remember that IB negates the supernatural effects in the air around it, such as luck and divine protection. The enchantment may work, but it'll probably run out faster. Probably.
The only reason he can't undo the Ars Magna is because it's being continuously cast and recast. Just like How innocentius was with the runes. If I remember correctly that is.
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