How about attacking the pillars causes the stones to fall?  

You mean fort?  

Initial idea was that any time a bomb explosion went off, rocks would fall.

But their purpose is not to be a defense but instead to encourage movement and activity.  

Posted by Rufus

You mean fort?

Freudian slip.

Posted by Dusty

Initial idea was that any time a bomb explosion went off, rocks would fall.

But their purpose is not to be a defense but instead to encourage movement and activity.

Could do both defense and movement concepts, but it's really up to you guys. I think there's a game where you destroy pillars and the stuff comes down from the ceiling where I can't remember the name of the game, or I might be imagining it.