How to get to the DLC Locations? (Code Vein)

Davis had behind three of Firefly, then I say: That get to the DLC locations I can across a new room, which is located behind the location of the boss of the Tower of the Crypt. I understand that this location is not yet reached, BUT when the game came, I vyskocil this notification(Screenshot), saying that I can get into this room, even if they haven't reached the Tower Tomb type near Davis should be a note, but it's not anywhere =(
Help who that knows about it?


Spoiler