In a world of desperate convicts, power mad sorcerers, and blood-thirsty Neverborn, these are the outsiders. The misfits of misfits, they are the shady characters waiting in the back of the bar to be offered a job from a nondescript man in a black cloak.
They are the cutthroats and mercenaries, loners and forgotten. They are the Outcasts.
The Outcasts are not really defined by anything specific, aside from the fact that they live on the fringes, pursuing their own agenda and generally answer to no one but themselves.
Many Outcasts have the Mercenary trait, which allows them to be hired by other factions at an additional cost.