Kostchtchie

Kostchtchie is a demon lord from the Dungeons and Dragons fantasy role-playing game. Like many of the game's demon lords and archdevils, Kostchtchie have his origins in real world myth. In Russian folklore and mythology, Kostchtchie is a hideous goblin (or a race of goblins) of death who lives in the mountains of Caucacus, supposedly lusting after young maidens.

In the Dunegeons and Dragons game, Kostchtchie made his first appearance in the first edition module S4: The Lost Caverns of Tsojcanth. He later appeared in the first edition Monster Manual 2. In the game, Kostchtchie is a demon lord who is so hateful and hideous that all other demons despise him. He appears as a bandy-legged, yellow-skinned and hairless brute (other than eyebrows) that carries a magic hammer which he squashes his victims with. It is revealed later that he resides on the 23rd layer of the Abyss, called the Iron Wastes, a realm of mighty glaciers and plunging temperatures. He rides a white dragon and is an ursurper deity of sorts: he has been converting frost giants from their patron god Thrym.

Kostchtchie has yet to have an official write-up for the game's third edition, although he is mentioned in some supplements.