The return of the Overlander

It has been a hard three years for Gregor. Ever since he left the Underland he has been in a deep depression. Grace is bent on keeping him away from the Underland at all costs but when an old friend arrives in search of his help, will the warrior be able to answer their call? Find out in this brand new Underland fanfic:/(Rated T/M for swearing, violence, slightly mature themes)