The Echo Realm

For reasons lost to time, society has existed underground. Isolated cites each with their own light, their own culture dot the cavernous landscape. For centuries, no one has dared touch the Surface, many believing it just a myth... there was nothing up there, just this cave system and the people that call it home.   However, one group of brave souls made for the Surface. Surely, if there was nothing there then why were there tunnels going up? Only one returned from that group, his mind shattered, mumbling about a barren, white waste.   Many believed the man simply mad but in the years following, the people have grown uneasy. Worse yet, the ground has started to move.