You got

Metalbending.

You are the refined edge — disciplined, precise, and capable of finding structure in chaos. Where an earthbender sees a boulder, you see the ore inside it. You break problems down to their components, reshape systems that don't work, and build new ones from the wreckage. You're not cold; you're focused. And the things you build last because you understand materials at a level that feels almost intimate. Your precision is your power, and your discipline is what separates creation from destruction.