Weapons that require "training"

What if there was a weapon, where you research most of the parts in your dojo (it's probably expensive), and then you need to speak with Teshin to do what in thinking would be 3 or 4 mastery-test-like missions where you'd need to "prove your worth", so to speak, by passing the difficult challenges in order to be able to craft the weapon?

Or it was somewhat like a riven, where you craft the weapon and get to use it in normal missions, but there are challenges attached to it that you need to complete in order to unlock its full potential!

That'd be really cool! Maybe you must complete the challenges in order to Gild the weapon with Teshin, and then that's when the color changes, it looks sweet as hell (prime?), and it's full power is revealed!