So, I just randomly discovered Boethiah's Shrine, and I have no idea how to start the quest. I arrived and there were multiple burned bodies around the shrine. There is a pillar in front of the shrine that says "Pillar of Sacrifice" and I can activate it. But when I press E, nothing happens. Is there some specific item I give to the pillar to start the quest?

If it's important, I'm playing a Breton mage at Level 13.

Tell someone to stand there and kill them.