An alternate dimension?..

How about if you defeat the ender dragon, then in a random end city close to the main island spawns a portal in a end ship, once you go in its like the end and you get a achievement called "An Alternate End?" BUT, no enderman,the sky is neon white, the end stone is white, Chorus fruit doesn't spawn, no end crystals to heal the dragon, end cities are blue and white like the end bricks is white and the purple things is blue, the ender dragon which is called in this dimension "????" is pure neon white besides the eyes which are neon blue, the dragon has the same powers as the ender dragon and 3× more health, he has powers like making lava fall from the sky randomly from high up, or (not often) trapping players in a obsidian box, Once he is killed then a big explosion happens just like which the ender dragon, besept its a tiny bit bigger and with blue particles too, you get a achievement called "What Have I Done" also these end ships dont give you elytras, they give you Elietras which are elytras but neon white with a neon blue star in the middle, and they fly faster then elytras, This is my idea, I think it has much mystery to it which I know you like, might be better off as a mod but hope you add it!