Goldthrax is a Fallen in Oninaki. It is the boss of Ophay Forest and is fought during Chapter 2 Part 3. It can also be fought on level 40 of the Sanctum of Rebirth.
Ten-winged hemispherical Fallen. Though they've lost the ability to fly, they can manipulate the wind by flapping their wings. They can cause wind to blow in one direction over an entire area. Use dash and other methods to avoid being swept up in the gale.