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In the process of completing the “Of Rats and Raiders” quest inNo Rest For The Wicked, players will have to go through the sewer system underneath the Island of Isola Sacra. This is a particularly treacherous area and shouldn’t be approached unless players are at least level 10.
Players will need to free Rattiganbefore they can start to explore the sewer system, but once they do, they will quickly come across a dead end. The only gate leading forward will be blocked, requiring the Drainage Cellar Key to proceed.

How To Reach The Sewers In No Rest For The Wicked
Once players reachSacrament, traveling around becomes much easier compared to before, since they canfast travel back to the cityfrom any Whisper on the island. However, the sewers are somewhat far away from the main city.
That being said, there is a shortcut that reduces the travel time quite a bit, saving players from fighting through respawned enemies and going through the entire Fort on foot.
A cutscene involving Rattigan will trigger the first time players reach this area once they free Rattigan.
Drainage Cellar Key Location In No Rest For The Wicked
The Drainage Cellar Key isn’t far away like many of the other keys on the island of Sacra. In fact, it can be found in the same room as the door it’s supposed to unlock. To find the key, follow these simple steps:
Now, players should have theDrainage Cellar Key. The Drainage Cellar key can be used on the left side of the Cerim Whisper, where the locked gate will be unlocked by it.
Players should keepa handful of cooked itemsin their inventory when exploring the Sewers. This area contains enemies that can poison the player, dealing a lot of damage.