The god Arioch plays a minor role in NetHack: When chaotic players get crowned, they receive the title "Glory of Arioch". This title shows up as one of the character's properties seen through enlightenment.
In the Elric series by English author Michael Moorcock, Arioch is the Chaos Lord served by Elric of Melniboné. Elric is also the possessor of Stormbringer, so it seems fitting that this weapon should be linked to the title "Glory of Arioch".
Arioch, the patron demon of Elric's ancestors; one of the most
powerful of all the Dukes of Hell, who was called Knight of
the Swords, Lord of the Seven Darks, Lord of the Higher Hell
and many more names besides.