Once the player has reached the end defeating the Ender dragon seems to be the final goal. What if defeating the enderdragon or end city offer some sort of key to the end’s next chapter? I think it would be nice to know more about the wither. The dimension, related to the achievement ‘The Beginning?’ Would consist of a wither-related environment such as wither stone, a dark grey block with a similar look to soul sand with more wither-looking faces on it, most likely wither rose to grow all over the environment, and also the addition of a new neutral wither-related mob so it compensates with the huge amounts of it will spawn there like Endermen in the end. The mob I think should be called ‘withered’ like the drowned for zombies drowning and withered for zombies withering away. They should be slow, but aggravated when you remove a wither rose near a group of them. The sky should be more paler than the end - possibly a dark grey, or purple. The boss should be called the wither emperor which will attack you with regular wither attacks including wither fall, wither heads falling from the sky crashing into the surface bursting out lingering wither gas, and also the swoop where the wither emperor can try to throw you at extreme heights. To defeat it you would destroy 8 solid blocks hidden around the island so the wither emperor cannot regenerate, then defeat the wither emperor to receive the achievement ‘Free the beginning’ and leaving to give the achievement ‘End of the beginning’ completing the second and final chapter. The key mentioned at the beginning of the idea will be called the wither sensor, crafted from end crystals and Redstone, it will slowly shift the player toward the direction of the ‘wither tomb’ where the portal is, made of chiseled red sandstone symbolising the wither. Placing the wither sensor on the pedestal will activate the doorway/portal into the beginning.
That was a stretch but hopefully most made sense
Hopefully a feature of some sort may of interested someone.