Space

Space is a layer appearing at the top of the world. This is at ~950ft and above for large worlds.

Effects
In space, air still exists, the breath meter does not appear.

Gravity is however decreased, which means that there is a constant effect similar to the featherfall potion affecting the player.

As it is empty (apart from the occasional floating island), space does not contain any materials. The mobs that spawn are equal to those at slighly lower altitudes: Harpies and wyverns. It is possible to get into space by using a gravitational potion.