A mage character so dumb that they only know one spell? That's fine. Seen it before, but it's fine. Mage character so dumb that they refuse to learn more than one extremely destructive spell because uh there is no reason? That's not a funny character.
It's like they started writing a Lina Inverse rip off character but stopped after "mage" and "destruction" because after that is where all the character is. I can't believe people defend this shit.