How to get in secret room in the Catacombs?

[Yₒₛₕ]

In the catacombs if you head straight from the entrance down youll reach some stairs. Go up the stairs and there are 3 crypt rooms. In the first one it shows in the Prima Guide a big temple like room you can enter, and the wall has a different texture then the rest

you can also click beyond it and your map also goes that way too. Don't know where the lever for it is D: helppp

[NixBoxDone]

That's the catacombs in the major city, right?

That temple like room is not accessible from the outside - the door is simply a piece of fluff for a different quest.

You'll have to find and solve that quest in order to reach that room. You enter it from an outside building and can then exit it into the catacombs.

Quest spoiler:

You can get the quest from one of the Cipher agents in Brackenhurrdy, the district in the lower right part of town - the agent is tasked with finding three missing people and will gladly let you in on the investigation if talked to.

[Yₒₛₕ]

Thanks yeah I just kept reading in the guide and saw the room is accesible only during the murder quest. :P