In one of the rooms there are a bunch of bricks on the floor that you can press down. Is there a specific order you have to press them to open the door? And if so can anyone help me out with it?

Also I have 4 cylinders that have writing on them and a picture of a creature. What do I do with these?

Any help would be epreciated.

The bricks are actually the lock of the treasure vault. There is a specific order in which to press them, but I only did this once and don't recall now what is.

The stele you've been picking up are used for summoning the Guardian. You'll find where they go, just around the doorway into the temple.

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I don't remember the order, I pressed randomly until it worked. But it wasn't very hard, it took me less than a minute.

The bricks can be pressed down from left to right, going back to hit one if it pops up again. Eventually you'll get them all down.

Are the cylinders you're talking about the religious steles? You can place them around the platform of the enterance to the Temple. If you find them all they'll summon the Guardian. He's hard-ass, though, so I'd recommend just killing off all the Yuan-ti.