Nail grew up in a Bugbear war band. He showed an affinity for the tribal magic of the shamans from an early age and so he was trained as a tribal healer. His war band’s leader hired them on in the service of a powerful Drow family in the Underdark. As things go in the world of the Drow, the powerful family was overthrown and many of Nail’s brethren were slaughtered or taken prisoner. A mere fraction of the war band escaped into the Underdark. It was then Nail began to question everything.
Nail believed that Bugbears were meant to be mighty warriors, not just some lowly canon fodder. Nail started to desire adventure. An adventure to make him a mighty warrior. This could not be found groveling at the feet of some evil benefactor.
When what was left of the shattered war band decided to hire on as protection for a Dark Naga, Nail had had enough. He argued with his brethren to hear him out and seek greater glory but they only had simple desires. Nail left the war band behind to rot.
Not knowing where to go, Nail remained on the fringes of where the war band was stationed. He explored and hunted the upper levels of the Underdark honing his fighting prowess. Things still looked bleak, though. Maybe Nail would die alone in the deep dark hunting glory…