Underdark

The Underdark is the vast network of underground caverns, tunnels, and subterranean realms that lies beneath the surface of Faerûn. It is home to drow, mind flayers, beholders, and countless other dangers.

The drow city of Sschindylryn lies in the northern reaches of the Underdark, and it is here that Yorick Osrin is secretly hidden by Shiawass, unknown to Chanteclair Osrin and the rest of House Osrin above.

Passages to the Underdark can be found in various locations throughout the Farsea region, including beneath Wyvernwatch Castle.