Try get the different type of elements but I can’t get it, there is a boss or enemy always drop that gun
Have gotten a Cryo and Incendiary version from Graveward, like with most legendaries in the game as drops are still being figured out he’s your best bet. Most drops are world-drops for now.
I can say most of mine have come from farming Sylestro and Atomic.
I was farming them for Amara and other things but ended up with every element Laser Sploder and more…