Whitethorn was originally created for a different serpent's skull game but wasn't chosen. As written, he's an oracle, but I can easily modify him to a cleric or druid.
Whitethorn grew up just outside of a small town near Egorian in Cheliax. His name began as an insult referrencing his love of the natural world and the history of the city. Considered an unpopular oddity, he was generally left alone, but sometimes harrassed, and on rare occasions, sought after for advice. In time, Whitethorn decided to try and find a place where he felt more at home. He traveled much of Cheliax and Varisia.
During his wanderings, Whitethorn has studied with druids and several of the more 'natural' clerical faiths, but non were his calling. Eventually he made his way to the Mwangi Expanse. For the last few years Whitethorn has earned a living working as a guide to Chelaxian explorers who favored him over the natives. Recently he received a vision of an ancient land in need of a defender. It made sense to him only when a scholar hired him as a guide on his trip to Sargava. Whitethorn believes that he has finally found his calling and hopes to find a home as well.