Decrepit Rune

Give to McCabe at Ward 13 to craft the Rune Pistol (Remnant II) handgun.

Obtain by feeding the Ravenous Medallion to the Nightweaver's Web at Tormented Asylum on Losomn.

Lore

A hardened shell houses some kind of luminous gem. It's unclear whether the shell was crafted or...grown somehow.

"There are worlds beyond ours—a thing made apparent with the twining of two of them, but rest assured there are so many more. Magic is innate to some, anathema to others, but all share it in some form. It is the life's blood of the universe."