Enter the main chamber, light a torch, then head through the doorway. Destroy the planks to reveal a new doorway. Beware of floor spikes. Slip under the gap to your left to open a chest with a weapon. Back in the corridor, the doorway on the other side is blocked by a wooden shelf.
Turn left at the end of the corridor, then kill the three snakes. Now turn right. There are lots of pots atop pressure pads. Destroy a path through the pots and deal with the snakes that hatch from the second cluster of pots. At the end, turn right after the big floor spikes pad.
Loot the chest and the pots, then destroy the wooden planks to reveal a chamber with the stele inside. Move the two wooden shelves to return to the original corridor. Watch out for the big spike pad as you leave.
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