The Chained Islands
Islands, floating in the sky with no explaination as to how they are staying afloat, both the sky above and below is increadibly treacharous, due to the endless chasm below having had no one escape from it, and those who end up on an island rising into the sky will experience 'the Crushing' as if the weight of the world crushed down on the whole island, the force applied depending of the height reached of the raising island, nothing on the lsland is safe from the crushing.