This short guide contain advice that will help you to get the code in the Tiltren tomb.
How to Find Passcode in the Tiltren Tomb
Can’t see any way to determine the passcode for entering the (presumably final) room? There are hints on the walls at different rooms. Sometimes hints are on the ground as well.
Each tomb has 3 symbols hidden somewhere, each symbol has a color.
Then notice the spinning lock on the door has a color on each cylinder.
Just add the symbol of the matching color in there and it’ll open.
Some are on the floor, some on the walls, and some are hidden behind objects so make sure you move the camera around a bit to check behind things.