Amnesia: The Dark Descent Walkthrough:Inner Sanctum

Continue running down the stairs! As soon as you reach the ground, pull
down the lever on the pillar to your left! You’ll notice that the entrance
on the left side will open so go through it.

You’ll finally reach a room. In front of you is a table with a note, to
the left is a weird circle on the ground, and to the right is an altar.
Read the note on the table.

This is another one of Daniel’s pages of the diary. In it, Daniel expresses
his anger towards Alexander because he was used by him and turned into a
murderer. Daniel couldn’t take this anymore so he really wants revenge.

Turn to the right and touch the pointy altar thing. It’ll prick you
and the lights will die.

Turn around and go to wall with the weird circle. The two candles beside
it will die. Stand near the center of the circle, then light up both
candles again. Be fast about it because the candles will be blown out
in a matter of moments if you don’t do this.

Exit the room and head straight to the next room right in front of you.
To the left is another altar, and to the right is another weird circle.
Touch the altar to let it prick you, then stand on the weird circle and
the two candles will die again. Light them up fast.

The entire area will start to be filled with the red organic matter. Exit
the room and look to the right. Suddenly, the big door is now open! Go
through it and enter the door into the Orb Chamber!