Add a hard structure

The only hard structure in the game is bastions rn so it would be cool if you add a structure that’s actually hard to loot in the overworld or the end I would rather have it in the end because once you reach there you will probably have full netherite already if you play it safely this structure could have the netherite upgrade template like the bastion and maybe have new mobs that only spawn there an with a diamond axe but the chances of dropping their axe is rare and make them able to jump unlike most other mobs to make them actually hard make sure the loot there is good though like maybe make elytras spawn there instead of cities and they don’t spawn in ships and they have a certain chance to spawn also to balance elytras a bit they are so op make sure the loot is also pretty good like the bastion and end cities but keep end cities for shulkers and the loot only and make elytras not spawn there