Can't open any door with wardstones in Durlag's Tower lvl 2

[Warlock]

So i finally reached Level 2 of the catacombs under Durlags's Tower.
I manage to open 2 doors by turning the heads of the statues and I finalle found 3 wardstones.

I read that those 3 wardstones should work as a kind of key to open other doors, but the don't in my case.
Do I have to use them in a special way ?
Does anyone have a hint for me ?

Thanks in advance !

Bye !

[wendigo211]

https://baldursgate.fandom.com/wiki/Durlag%27s_Tower_Walkthrough
https://baldursgate.fandom.com/wiki/Durlag%27s_Tower_(Labyrinth_Level_Two)

It's doable blind, but there are a bunch of obscure puzzles, like hitting the training dummies, etc. Once you get to a room with a bunch of switches on the wall you can open all the doors. A bunch of the wardstones you pick up are also red herrings and don't do anything.