A new way to get Elytras

Elytras are an unbalanced item, after receiving them, any type of transport becomes absolutely useless. An excellent solution would be to complicate the way to obtain them. But it's not about lowering the chance of finding them, I have a better idea. Add to ships at the end of a new mob. Flying enderman. This will be the mob that guards the flying ships in the end, it will fly around and attack those who get on board. He can have two phases, the first phase where his attacks are weak, but the Enderman flies around the ship, dives at the player, deals damage, teleports high into the air and continues his flight. And after receiving a certain amount of damage, he will go into the second phase, where he will not fly, but the damage will be more increased. He will eventually drop elytra with some chance