ender raid

Do you remember what happened in widnows 10 edition when you set time in a negative number? Maybe good idea is make a new gamemode, gamerule or world setting where you must get hurry ang kill ender dragon before mysterious object destroy all world. In a 1-2 hours of playing in a new gamemode a giant object will appear on sky and starting destroying world. First a day-night cycle will get broke, secondly  world structure will get deformated, and in the last an enderman will spawn in large amounts with thier battleship and world will get completly destroyed making only some foating islands left. Only killing ender dragon will stop that apocalypse.