To deal with the Shambler in Chapter 6, follow these detailed steps:

### Step-by-Step Guide

1. **Locate the Dagger Display Case**:
– Move towards the gallery and look for a glass display case with a dagger inside. The case is located to the left of the Shambler painting and has a mask with green lining on it to the left of the dagger and an open box to the right of it.

2. **Examine the Dagger**:
– Stand in front of the display case and interact with it. This will give you an interaction icon, and you can examine the dagger more closely.

3. **Get the Dagger**:
– Break the glass display case by interacting with it. This will allow you to pick up the dagger.

4. **Hide in the Wardrobe**:
– Since you just made a lot of noise, return to the wardrobe in the room and hide inside. Wait for the Shambler to move away before proceeding.

5. **Locate the Canvas**:
– Once the Shambler has moved away, leave the wardrobe and locate the canvas from which the creature emerged. This is the Shambler painting.

6. **Interact with the Canvas**:
– Quickly run to the Shambler painting and interact with it. This will trigger a cut-scene during which you will use the dagger to cut the canvas and temporarily exile the monster.

7. **Post-Fight Actions**:
– After the cut-scene, the room will return to normal, and you will have a short discussion with Cat. You will also receive two achievements: **From Beyond** and **The Thing on the Doorstep**.

### Additional Tips

– **Avoid Looking Back**: Looking at the Shambler will cause Pierce to lose sanity and slow down. Try to avoid looking back at it as much as possible.
– **Use Closets for Hiding**: If you need to hide, you can use the closets around the room. However, there is little reason to hide if you stay running and keep moving.
– **Stay Moving**: Keep running and moving while crouching to avoid the Shambler. This will help you stay safe and avoid losing sanity.

By following these steps, you should be able to successfully deal with the Shambler in Chapter 6.