2) It's not a weakness though retard, Thor's lightning isn't special so that it harms anyone, it just calls down strong ass lightning, which for Superman is nothing. Nor is Mjonilr enchanted to smash anything, it's enchanted to be unable to be picked up by the unworthy (including Superman).
2) Thor doesn't use magic, he's not a mystical god, he's a brute force god. He calls down lightning naturally because it's his god power to control thunder/lightning, like Posiden can control water, which means yes, Thor can deal the most intense lightning around, but it's not any worse than something that naturally occurs
How can you not understand that Superman is vulnerable rather than weak to magic>Spell that summons a lightning bolt down on a target
Nothing will happen to Supes because lightning isn't shit to him>Spell that creates fire that will burn anything
Will burn Superman because he is afforded no EXTRA protection against magic.
If your magic isn't powerful enough to