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That seems fairly broad. What you're looking for might be in Tropes in Shining Armor (Index of armor tropes).
Yeah, what do you mean by "Anti-X"? Nullification? Does it just increase the defense of the fighter?
Anti-Magic would be a good place to start looking.
No It mean it will crush The X
Could you provide an example from media?
Trouble Cube continues to be a general-purpose forum for those who desire such a thing.
Fire Emblem:Dragonpike With Wryven Kinght
So an X holding a Weapon of X-Slaying?
I don't think there's any particular trope for that. Depending on context, the character might be a Hunter of His Own Kind.
Trouble Cube continues to be a general-purpose forum for those who desire such a thing.
What's the trope about Something (Like Fighter) Equip Anti-Something (Anti Air)
Edited by CholoLoon