Hey! So here's what I'm thinking.

Because this object was a triangle, I thought maybe it could just be a very advanced boobytrap. It emitted very negative emotions, intended to make anyone who found it turn back (or... kill each other). It didn't stop until it was knocked off the pedestal, and then it revealed the next passage. 

Now I'm thinking that Yerbol could be the one having these visions and extreme reactions because he touched the plagued troopers. Looking back over what we've written, Leoria never did.

He could keep having visions/reactions as they move closer to the actual relic, and once they get there, that power might drive him to be the one to grab it. What happens then, I'm not sure yet!

How does that sound?