i think what you need to do is add the ability to choose what Mobs you want to spawn,and have them spawn in one area,and then also add command blocks that will add enchantments of your choice,you know the /enchant type stuff,and also something special for the Elytra,like......i Giant Zombie battle!like an actual Giant.i can help,im VERY freakin good with commands.so anyway,that aside,GOOD LUCK

Thereis more to Come to this map!
If you have any suggestions, List them here!