Ainz - Armor Limitation

Momonga was about to cast a spell, but he realized his armor was in the way. Certain magic users had a skill that let them cast spells in armor, but he hadn’t learned it, so his heavy armor would impede his magic. Just because he’d created the armor with magic didn’t mean it came with amazing bonuses. There were only five spells he could use under these conditions, and un-fortunately the spell he wanted to use was not among them.

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Volume 1, Chapter 3.1