In The Aether II, islands generate at an average of 58 y but can reach as low as 17 y or as high as 98 y. Going past -0 y will cause the sky to blacken completely, and going past -2 y will cause the player to fall into The Void. The sky will begin to gradually darken (increasingly sized black specks, until nothing but black) the further a player flies down towards The Void. Cold Aerclouds can generate as high as 101 y, Gold Aerclouds generate at an average of 114 y but generate as low as 101 y or high as 127 y. Aether Portals will spawn at an average of 44 y. In The Aether, islands generate at an average of 54 y but can reach as low as 18 y or as high as 90 y. The very bottom of the Aether is technically considered The Void and going past it will cause the player to fall out of the Aether, be teleported back to the Overworld while high in the air, and land with nearly always fatal fall damage back to where their Aether Portal is. Purple and Storm Aerclouds instead follow the opposite, only spawning below 32 y. With the exception of Gold Aerclouds, and Purple Aerclouds and Storm Aerclouds in The Aether II, Aerclouds can generate as low as 0 y and certain layers depending on The Aether or The Aether II. Overworld Aether Portals leading here will spawn the player at a common range of y layer. Mobs falling to their death is a very common, especially if a player flies below using Creative Mode, and not even Moas are safe. Islands can vary in size, from barely being landmasses, to spanning thousands of blocks in distance. Islands generate at a specific range of layers in the Aether, as a result, islands in the Aether tend to occupy an 'equator belt' of the Aether, not being able to generate above or below a certain threshold.

Aether 2 mod 1.6.4