Most cities in Aetherius have sewers. These are dangerous places full of rats and other vermin of much greater power - which should be a strong warning to younger adventurers in Perception! City governments are pleased to accept the assistance of brave adventurers who attempt to cleanse the sewers of their dangerous denizens. To enter sewers, your Survival skill must be high enough to give you the ability 'sewers.' You'll know you have enough skill to enter when you type 'ENTER GRATE' and it works! Sewer entries appear similar to: "A sewer grate looms darkly beneath your feet."