Roc are a species of avians: they're known as the larger avians in the world, nearly matching the dragons in size. They're believed to be poorly sentient, unable to communicate with dragons differently from griffaran or Yikyans.
They usually live in high peaks, uninterested of dragons or hominids.
However during the rule of the Red Queen, they were took in captivity into the Ghioz Empire, tamed and breeded for military purpose.
The Red Queen ordered the formation of a military corps of Roc-riders, to match the dragons in battle.
Despite having no fire and being less muscular than dragons, they were faster and their talons and beaks were lethal.