This page contains IGN's walkthrough for Ridge of Frozen Souls in Code Vein. In order to reach this area, you need to have defeated the Successor of the Ribcage boss in the Cathedral of Sacred Blood.

The difficulty spike from the last boss to the Butterfly Delirium fight is noticeable, but IGN is here to help. As you can see based on the boss' attacks, coming prepared with Antivenom is a good idea ...