The Vault of Thorns is a Demi-plane created by a council of druids. It's entrance can be accessed deep in Ghost Light Marsh. This council's realm was a Marsh deep in the Holds of Belksin. As the Orc's conquered area after area the Druids were not able to stop them. They stashed a cache of anti-Orc weapons in the Vault and then in an odd ceremony killed themselves and rose as Will O Wisp. From then on the swamp was known as Ghost Light Marsh. The Trunau Four traveled here to recover the cache of weapons to fight Orcs and Giants. It was here Gormlaith and Ben Verine died. It was also here Della Narn was trapped, and Lorc found Beary Connick Jr.