There was an ancient and dangerous tomb in Gillian's Hill that led to the Underdark. Formerly held by illithids, the tomb was cleared by a band of adventurers in the mid-1300s DR. The tomb was later spell-guarded to warn of entry from below but it was far from safe.
- ↑ 1.0 1.1 1.2 Ed Greenwood (1994). Volo's Guide to the Sword Coast. (TSR, Inc), p. 40. ISBN 1-5607-6940-1.