Of Rats and Raiders is the quest after entering Sacrament and meeting the Watcher in No Rest for the Wicked. In this guide, I’ll walk you through the second part of the quest, which occurs after freeing Rattigan but before entering the Water Channel of the sewer.
The Of Rats and Raiders Sewer quest section also consists of a bug which relates to collecting the water channel key in the Black Trench. This might get fixed in the future. However, until then there is a solution that might help.
For the first half of the quest, check out our walkthrough here. It goes over getting the quest, defeating Darak the first time, and freeing Rattigan.
SEE ALSO
Meeting Rattigan at the Sewer
Exit Sacrament from the main entrance and head west.

Continue walking northwest at the fork in the path.

When you come to the area with the bridge towards Mariners Keep, stop. Instead of pushing through there, climb down the ladder as if you were going to the Potion Seller quest.

To continue on with the Of Rats and Raiders sewer section simply jump down from the platform into the water below.

Swim to the west and stand on the piece of land in front of the sewer entrance. Rattigan will appear and open the sewers for you.

All that’s left to do is venture into the sewers.

Finding Darak in the Sewer
After entering the sewer, follow the path northwest.

The following area has an archer and a locked door requiring the Drainage Cellars Key. There’s nothing to do here yet, so head to the east.

There will be a campfire here to rest at. When you’re ready, head to the set of stairs a little further up on the path.

Take these stairs to travel lower in the sewer. This area contains a Whisper, which you should save at.

Afterward, walk down the winding stairs to reach the bottom level of the sewer.

There are six enemies in this area. There are three mutated rates, two large parasites, and one Risen. I recommend taking the path on the right, as it will allow you to sneak attack the Risen.

After defeating the Risen, travel to the area in the back while fending off the other enemies.

There will be a body on the ground holding the Drainage Cellar Key.

With the key in hand, return to the previously locked door by the archer and open it.

Follow the cellar’s path to the west to watch a short cutscene between a Risen soldier and another Risen infected with the Pestilence.

After the scene, head down into the area and kill the parasites that remain. They can poison you, so make sure to avoid their bites. Afterward, head to the statue at southern end of the room.

Pull the lever at the statue to unlock a bridge to the other side of the area.

This area is extremely dangerous. The left side has multiple Parasites as well as an infected Risen to fight. What makes this even harder is the fact that killing an infected Risen will create for more parasites to fight. All of these enemies are very dangerous up close, so make sure to move out of their range after attacking.

To get deeper in the dungeon, you’ll need to head to the right. You’ll have to fight another infected Risen here.

Now head into the gap in the wall. There will be a second infected Risen and two infected rats in the area.

After entering the area, the second infected Risen will be on the right side. The path you need to take is through the center, so its up to you if you want to fight or not.

At the end of this path is a statue with a lever. Make note of the platform near the boxes as well.

Pull the lever and quickly run to the platform next to the box. It will rise into the sky with you on it, giving you access to the upper left and right sections.

Start by doing a running jump to the right section. There will be two Risen soldiers here, one with a sword and one with a heavy axe. Defeat both and climb the ladder.

There will be on Risen soldier with a crossbow and a sword up here. Make your way up the path while fighting him.

The end of the path has another statue with a lever. Pull it to extend a bridge to the platform across the gap. This will create an easy path between these upper levels of the cellar and the entrance to the Drainage Cellar.

Now return to the floating platform and make your way to the left side. There will be a campfire here, so cook if you can.

Travel north up the path. The lower area here contains a few parasites. Defeat them and climb the stuff in the corner to reach the next area, which has an infected rock-throwing enemy as well as an infected rat.

After beating both of them, as far up as you can and enter the door in front of you.

This area will have one last statue with a lever. Pull the lever to connect the cellar’s starting area with the area directly across from it.

Hop down from the platform, heal up, and cross the bridge. There will be loud sounds coming from the wooden door next to the end of the bridge. However, you’ll need to get the key for it first, so head along the path to the west.

There should be a stronger enemy in this next area, who you’ll need to defeat to get the key. However, there is a chance that this encounter will be bugged and the enemy will not appear. This occurred during my first attempt, preventing me from continuing forward in the dungeon. Some players can reset their game or the dungeon to make this enemy appear.
THE BLACK TRENCH BUG IN OF Rats And Raiders Sewer Quest
This bug occurs whilst searching for both the water channel key and sewer lever key. Whilst some players were able to solve this issue by resetting the game or dungeon, others simply found and defeated the fiend over by the closed door.
However, none of these is a guaranteed fix. Sometimes this fiend does not even spawn. So another workaround is to roll to the door then press Y whilst continuing to push up with the analogue stick. Essentially rolling through the door.
Another workaround is to head to the locked door, open the map menu and use the map to teleport to the next area.

Once you have the Water Channel Key, head through the door to begin the next section of the Of Rats and Raiders quest. This concludes the Of Rats and Raiders sewer section.
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