Look around first.

Figuring there must be a reason, you search the area with your aura reading spell and sure enough you eventually find a small locked puzzle box at the base of the left pillar. You find some shade and set to work figuring it out. Hours pass as you work on the intricate sliding mechanisms. You eventually pause for lunch, then dinner, all the while it seems to be growing. Twisting, sliding and moving pieces causes it to grow bigger and bigger till you have a very creepy looking box that really looks like a coffin. Finally you hear a click and a latch appears on an edge. You are a little afraid to open it expecting to find a body. With a sigh you also can’t help but think some part of it was causing a delay because it just happens to finish just as the sun goes down. “There is going to be a vampire inside, I just know it.” You say looking at the latch.