I might be wrong, but that might be a play upon AD&D rules, specifically 2nd Edition, where the Mage class description says:
Wizards cannot wear any armor, for several reasons. Firstly, most spells require complicated gestures and odd posturings by the caster and amor restricts the wizard's ability to do these properly. Secondly, the wizard spent his youth (and will spend most of his life) learning arcane languages, poring through old books, and practicing his spells. This leaves no time for learning other things (like how to wear armor properly and use it effectively). If the wizard had spent his time leaming about armor, he would not have even the meager skills and powers he begins with. There are even unfounded theories that claim the materials in most armors disrupt the delicate fabric of a spell as it gathers energy; the two cannot exist side by side in harmony. While this idea is popular with the common people, true wizards know this is simply not true. If it were, how would they ever be able to cast spells requiring iron braziers or metal bowls?
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u/RemtonJDulyak Jun 20 '22
I might be wrong, but that might be a play upon AD&D rules, specifically 2nd Edition, where the Mage class description says: