- This page is about the physical Underrealm. For other uses, please see Underrealm (disambiguation)
A vast network of caves stretching beneath the surface of Achaea, the Underrealm (not to be confused with the Underworld) is the racial home of such creatures as hobgoblins, goblins, ogres, horkvals, and even the dreaded Tsol'teth. Known in the Tsol'teth tongue as "Anzari-tarin," which means "World of Darkness,". The Underrealm was recently rediscoved with the help of Parni deSangre in the second Black Wave, the only known way into the Underrealm is through an archway in the Tsol'teth fortress in Pash Valley. Attempting entrance into the archway without the blood of a Tsol'teth will result in death, so special care is need in order to enter the Underrealm