Gregornous as depicted in Rage Across Russia.

Gregornous Deathwing is a zmei dragon, a magical entity that was once an agent of the Wyld. He was summoned by Baba Yaga to destroy her Nosferatu sire alongside another six zmei. Baba Yaga, having become an agent of darkness, turned the powerful zmei into her thralls as servants of the Wyrm. He awoke during World War II. [1][2]