This is an instanced sewer containing a tribe of goblins, the Gobblerock Clan. Three named bosses can be found, each of which has a fair chance of dropping good loot and/or Master spells. If you can defeat the goblins, then you might want to try the hardest challenge: a level 33 ^^^ slug named The Gobbler.
Zone in using the drain cover in The Commonlands, located in a tower northwest of the Sprawl zone line at ( -1415, -70, 234 ) /waypoint -1415, -70, 234.
Purchase a key and book from Karmen the Swindler in The Lonely Tower Camp ( -1320, -50, 580 ) /waypoint -1320, -50, 580 and examine it then you will be able to join this zone.
A creature named Gobblerock and his group of goblin bandits have taken up residence in a newly unearthed section of the Freeport Sewers. They have been credited with terrorizing the merchants and militia of Freeport and are becoming a thorn in the side of the Overlord. These dastardly goblins constantly sneak into the city and pilfer supplies, food, and weapons. In response to this ever-growing threat, the Freeport Militia has sent Captain Ista into The Commonlands to investigate the situation and recruit willing adventurers to assist in cleaning out the sewer system.