When the dwarves of Andron first began taking slaves their superior technology and strategy helped them capture many humans with easy. To resist them some humans prayed to their sun god, or their war god, the Altkar tribe turned to their patron Tormos the God of the Hunt. He taught them guerilla tactics which they used to resist the dwarves, but these tactics where not good enough, so Tormos blessed them with the ability to change their shape gaining lycanthrope like abilities. The dwarves came to know these creatures as Shifters.
Even after the end of slavery Shifters have stayed far away from typical dwarven society preferring to live among their own kind, or other outsiders. Those who do venture into dwarven civilization tend to be exiles or adventurers, and tend not to interact well with others.