In the 7th Sea tabletop role-playing game setting, Koshchei Molhynia Pietrov, aka "Koshchei the Undying" is an enigmatic Boyar who entered into a strange contract with the Baba-Yaga-esque Ussuran patron spirit in order to receive a form of immortality. In contrast to the usual myth, he is portrayed in a sympathetic light and seems to be intended to serve (similarly to the Kami, Togashi in the Legend of the Five Rings RPG by the same publishers) as a source of adventure hooks and occasionally a Donor (fairy tale) to whom it is perilous in the extreme to apply.