Board Thread:Questions and Answers/@comment-27538855-20160420144555/@comment-26959384-20170302113934

I believe the ghost leviathan is actually for the Lost River.

Reapers I believe are planned to be added to the Void in order to prevent players from leaving the map. I do hope that, when that does happen, they extend the void area so that it contains a gradual dropoff of land that you're not intended to cross (it would get lower fairly rapidly until it eventually would be too deep for any of the existing machines to go past; it would go beyond 1700 meters).