You start in the great libary of Candlekeep, on the western shores of the sword coast, where you grew up as the foster child of Gorian, along with Imowen, Gorains other foster child. After a short time in Candle keep you venture off with Gorian to start your adventure...
The goal of the game is to free the sword coast from the multiple problems that seem to have be plaugeing it, and to slay the evil Serevok.
