Where do gold crenelated swords drop

I know where really bad white and purple ones drop(vermin) but i duno where the max gold ones drop :S

It's called luck. Oh and try chests, they are more likely to be gold.

i'm assuming its also the same place where white/blue/purple/green ones drop.

or maybe the elite missions.

Nahpui Quarter tends to drop a lot of those swords as I believe the Star Bright or whatever they're called carries them as weapons (Don't quote me on that).