I've heard about the Wall of Flesh boss coming in Terraria patch 1.1. It will appear in the Underworld, and defeating it will make the world enter Hardmode. But there's a serious lack of information about this boss. How will it be summoned? What will be the penalty if one fails to beat it? And how to prepare for it. Build an extremely long battle platform in the Underworld? (I'm doing that right now, actually.) Could somebody please give me a link to more information?