A two-way portal leading to Ooltul was located somewhere in Xunqaq. This gateway was used nightly to ferry slaves bearing scrolls, gems, minor artifacts of ancient Netheril and new beholder configurations. Once the Sharn Wall was compromised in the Year of the Unstrung Harp, 1371 DR, the portal functioned as an emergency escape for the phaerimms that secretly ruled the realm.
- Bruce R. Cordell, Gwendolyn F.M. Kestrel, Jeff Quick (October 2003). Underdark. (Wizards of the Coast), p. 167. ISBN 0-7869-3053-5.
- Eric L. Boyd (1999). Drizzt Do'Urden's Guide to the Underdark. (TSR, Inc), p. 74. ISBN 0-7869-1509-9.
- Richard Baker, James Wyatt (March 2004). Player's Guide to Faerûn. (Wizards of the Coast), p. 167. ISBN 0-7869-3134-5.