eq2 quest:The Sewer It Key  

You receive this quest by purchasing a key from Karmen the Swindler, located at the Commonlands tower just south of the Sprawl gate (-1,339.19, -53.44, 578.25). This is a sturdy old key of some sorts. It looks as though it could unlock a grate of some sort.

Obviously this is the key required to gain entrance to Gobblerock's Hideout, whose entrance is located in the Commonlands tower just north of the Sprawl gate (-1,415.46, -70.34, 234.17). This quest simply allows access into the hideout, which has a nice assortment of loot, experience and quests for you.