The All Powerful Ender Chicken

Step 1:
After beating the dragon. A purple pedestal will be placed at the coordinated 0, 100, 0. Or for people who don't understand those terms, a bit above the egg's placement position

Step 2: The Dragon Egg's Link
We all probably at one point wished the dragon egg had a use. Now the time has come! Right-click/interact with the pedestal while holding the dragon egg, the egg will be gone but now you will have the ender egg positioned above the pedestal. Now, throw the egg and see the Ender Chicken hatch.

Step 3: The battle of the century
Hold your weapons and prepare because this boss is not a joke. It can kill player in creative mode. It will cover everything 64 blocks or less away in a powerful white fog. First thing you need to know is that bows and fireworks will just make you get insta-killed. Using an iron golem doesn't work because if anything isn't a player then attacks it, then the attacker dies. It has 9000 health. It can only have a maximum of 6 damage dealt to it at a time so even falling with a mace from 1000000 blocks will only deal 6 damage. It also has 2 other attacks. The minion summon and the cluck of death. The cluck of death can kill targets from 16 blocks away. The minion summon just summons a few minions. /kill doesn't work on this boss. Once you beat it. You will get a new friend.

The Outcome
Now that you have beaten the most powerful boss. You will get rewarded with the most powerful pet, the Ultimate Chicken. This mob can deal 100 damage and will be automatically tamed to the closest player when beating the Ender Chicken. It attacks what you attack. When fed a netherite ingot, it will have a ten second cooldown of being fed another one and will kill the target if it is close enough.

Final Notes

This boss will also say things in chat.

It also has an attack where it can teleports to you and makes an explosion where it WAS.

It can also randomly break blocks