It's plain compared to the engravings and ornamentation on the pillars and doors, but the size is imposing. You wouldn't have a hope of just climbing onto it without a sizable ladder.

If you really crane your neck, or look from a way back, you'll see the trio of red, glowing orbs floating right up at the top. An electric sort of effects crackles between and around them. It feels terrible, makes your chest tighten to look at.