Penumbra and Umbra drop

[Acany]

Are these weapons (Penumbra and Umbra) crafted or are they drops (random or named)? I seem unable to find them. :/

[Suzaku]

Drops from enemies. You can't craft special versions of weapons.

[Acany]

Ok thank you. Are the drops totally random or do they drop from specific areas or specific enemies?

[Suzaku]

I think some weapons drops can only come from certain enemies, but I'm not sure about Penumbra and Umbra weapons in particular.

[Duneman]

I dunno if it was random chance or not, but I did find the two paired together in a Valuable Shipwreck in the G&B base in Zharkov. I believe location challenge loot like those are static...

If you haven't picked that out yet it's in the portion of the main pipe on the base that runs through a tunnel a mountain.

[Dixa1]

i have crafted penumbra primaries using the ? random craft option. only superior versions though