Zenith Dimension

We have the nether dimension, which is a fiery hellscape and a pretty cool dimension to be able to travel to, and the End dimension, a pretty cool place to beat the game. But we don't have any other possible dimensions to explore, even the obvious opposite to the nether- a sky/heaven dimension. 'Zenith' is a suggestion, based on the idea that since the Nether is named after a low point or area, 'Zenith' refers to the highest celestial point.

This dimension could be accessed by crafting a special portal, accessible before the player gets to the Nether. (I think all dimensions should be accessible without going to another, like how the nether just needs items from the overworld) Instead of the classic purple portal, the portal color would be bright honey yellow with swirls of paler white. This is due to them being exact opposites, as purple is opposite to yellow on the color wheel.

In the Zenith, you should walk on sky islands, floating above the clouds. You should be able to do quite a few things, like discover structures (perhaps sky castles?), gather unique materials, and see interesting mobs. This dimension could be the only place to gather a material necessary to craft weather-changing items or potions. The potions only last for a short time, but they can summon types of weather the player would desire, such as clear weather, rain, or thunderstorms. This could help summon a specific boss, that is only triggered with a certain structure of blocks and struck by lightning.