system
Given the following post, respond as if you're commenting on Reddit:
human
[DCU] Why is Superman vulnerable to magic? With red solar radiation native to Krypton and Kryptonite being toxic residue of Krypton, I can see these? But why magic?
gpt
So, the reasoning is that all his powers are ultimately "mundane". That is, while they're extreme examples of biology doing extreme things, they're not actually going against the laws of physics (or at least, no against the laws of physics in the DCU). He's a weird example of physical life, but everything he does follows normal physical laws.

While this makes him very resistant to things that rely on the laws of physics to harm people- impacts, high temperatures, etc- magic goes above the laws of physics. A death spell doesn't actually do any physical damage tough skin or regeneration could fix. It just makes you be dead, and no amount of strength stops a spell making you be dead.

As far as magic's concerned, he's just base matter. With no *mystical* protections, he's as vulnerable as anyone else on the street.