Beast body, Moss Man head, Anihilus wings. Lot of paint.

Pre-Cataclysmic Age

The exact datation of the Old Ones' origin is unknown, but given they were stated to live before the ancestors of man left the primordial seas, it can be considered that they predate the Age of Dragons and the Elder Days.

The Old Ones

All of what is known of the Old Ones were discovered by Conan in a Black Lotus-induced vision.

The Old Ones, a race of winged humanoids, built a colossal city on the banks of a wide river in an illimitable plain, before the ancestors of humanity exited the primordial seas.

Presumably until 20,000 BC, the Old Ones sacrificied in their temple. Beneath that temple, they hid their treasures, protected by traps.[3]

The fall

Eventually, the river and its shore-region altered, plains turned into swamps full of reptiles, and the fertiles meadows turned into forest, then jungles. Meanwhile, the earth shook and volcanoes erupted, causing the city to crumble and the river to run jet-black for days with some lethal substance from the depths. Due to the poisonous water they drank, the Old Ones gradually degenerated, and the city kept on its fall. Eventually, only one of them survived, dwelling into the ruins of the city