Crimson Longinus
Legend
Yeah, the issue is that if level 20 Wizard gets to be Doctor Strange, then level 20 fighter cannot be Conan or it is blatantly imbalanced. D&D casters are far more powerful than casters in most fantasy fiction, whilst martials are relatively mediocre. If casters only had pretty limited magic like for example in the Middle Earth, then that could be balanced with martials remaining 'normal people' even at high levels.