Wishbone
Paladin Radmaster
I wonder why fighter hero in fantasy always find a way to overcome the evil priest or wizard.
Clearly they all took the Mage Slayer feat!
2) Anti magic. Fighters cannot do all the fancy magic tricks, but they are the ultimate answer to them. They can cut through walls of force, reflect fireballs back at the caster, cut through summoned creatures with ease, senses that beat invisibility, they are hard to scry on, and even divination start to have trouble detecting them.
your magical power is the ability to beat magic, which is a solid niche at high levels where magic is everywhere.
I like this a lot. Feels very fitting to have a character so grounded in mundane skill that they can shrug off efforts to change reality around them. A little bit of Terry Pratchett flavoring coming through maybe.