Mageslayer

Among fighters some dedicate their training to the destruction of mages, perhaps because they view magic as a coward's tool or perhaps to prove some point about the general populace's reliance on magic, regardless, Mageslayers are the terror of all wizards, sorcerers, and other casters, cutting through their spells with ease and revealing their true weakness when they don't have the crutch of magic

Magic Awareness

You have honed your senses to be able to sense magic perfectly, and have studied to understand its properties. You gain proficiency in arcana. Additionally, you are constantly under the effect of the spell detect magic, however this ability is considered non-magical and therefore cannot be dispelled, and is not negated by an Antimagic Field.

Magic Resistance

You have honed your body to resist magic and can easily brush off most spells. You have advantage on saves against spells and other magical effects.

Spell Counter

You have learned how to prevent spells from even reaching you, destroying them as they're cast. When a spell targets you or when you are in a spell's area of effect, you may use your reaction to counter it, causing the spell to fail and have no effect. This ability can only be used on spells of a level equal to or less than half of your fighter level (rounded down). You can use this ability a number of times equal to your proficiency bonus and you regain all expended uses when you finish a long rest.

Dispelling Strike

You have learned how to physically attack your enemies' spells destroying them with your sheer physical might. You can take the attack action against spells and magical effects, so long as their duration is not instantaneous and their target or area of effect are within your reach, if your attack roll is equal to or greater than 10 + the spell's level, the spell ends.

Antimagic Aura

Your skill in negating spells is so great that you can now project an aura of Anti-magic.When you use this ability, for 1 hour a 10-foot-radius sphere of antimagic surrounds you, this ability is considered non-magical and therefore cannot be countered by Counterspell and it does not require concentration to maintain, otherwise, this ability's effects are identical to those of the spell Antimagic Field. Once you use this ability you cannot use it again until you finish a long rest.