Guild Wars 2

get all the materials you would need to make every sigil in the game.
get them all multiple times, of course (this is legendary level crafting)
a few gifts for good measure
and some other random, somewhat expensive, but obtainable item.

what you would produce is a Legendary Sigil, which out of combat would allow you to change your weapon’s effects on the fly, just like changing it’s stats.

thoughts?

You need ascended first…