Talk:Valteil/@comment-79.220.10.139-20190118191531/@comment-38081270-20190118194250

You can, but you don't have to.

Using the Cube of Depths, you can jump between the Light and Dark version of the city. Jump back to the Dark version, there should be some huge holes in the ground. Check those holes, one of them allows you to inspect and jump into it.

Jump into the hole.

The hole leads to an underground lab that also leads to a hidden artifact weapon, as well as shortcuts through the city. In the underground lab, there are pods with liquid in them, you can use some of your own blood to grow a clone of yourself, which you can use as a sacrifice.