The Blackwing Titanbird is a colossal flightless avian-reptilian hybrid native to Geba's coastal boundary between Northern Thazvaar and the Uncharted Continent, dwarfing the Redback Titanbird with a wingspan of 150 to 200 meters and estimated weight of 40,000 to 80,000 tonnes. Its seamless black plumage darkens fully in maturity, and it remains motionless for years along Thazvaari shores, ignoring human presence entirely until sudden terrain-shaking movements or rapid ocean dives break the stillness without warning.
Anatomically winged but incapable of sustained flight, it glides briefly or rears on hind legs during rare intraspecies confrontations, where the smaller combatant yields without full engagement. It is a fast swimmer that vanishes into ocean depths to feed on marine prey, and its behavior beyond the observed coastal standoffs and glacial stillness remains entirely unknown. No one has followed a Blackwing Titanbird into the water and returned to describe where it went.