- The Sladeborne were first revealed as a mob in Alpha-0.
- When the Apocalypse occurred, the sentient avian races didn't think to go into the Underrealm. Their first inclination was to take to the sky. The Sladeborne race is indicative of what happened to those who chose not to take refuge in the Underrealm.
- Sladeborne tribes.
There are bastions that existed of the avian-like races in AoC on Verra before the Apocalypse and before the remaining major and minor races fled to the Underrealm, that held out for a period of time. But there's specific reason why in A0 one of the first races you experienced as monsters or NPCs was an almost humanesque avian bird race. This particular race is I think indicative to what happened to those races because they chose not to go to the Underrealm and there are specific war reasons as to the leaders of those minor races that chose not to do so, which will be revealed in future stories and questlines. – Steven Sharif