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To get to it, you'll have to arrange the djose spheres properly, and before approaching the set of stairs, you have to examine the glyph in front of the wall where I said the destruction sphere was.
Its a long a tedious exercise to write out exactly how you light up the glyph in the first place, but basically keep fiddling around with the spheres until it lights up. Just make sure you don't go up the stairs and finish the temple before you have the destruction sphere.