The Founding of Tiriande

In -430 DR, a band of adventurers led by the human Tiriande found themselves trapped in a seemingly endless dungeon after disappearing on a quest. Unable to find a way home, they formed alliances with a clan of orcs and a tribe of merfolk, founding an outpost that would, over the next few decades, grow into a village known then as Sar-Vistu - Netherese for Basecamp.
Tiriande, who hailed from the region that would, centuries later, become the human nation of Cormyr, was joined by the elven priestess of Selûne Adriella Lirayne, her sister Maressea Lirayne, the Netherese wizard Magister Valorast, and two halflings that history has forgotten the names of.