AME's Mobs

The mod adds animated boss and mob encounters to the End. The Ender King is summoned with a Ministerial Rune crafted and used with an End Crystal in the off hand, and it then appears after a short delay. Its staff sweeps, drives it forward, and smashes the ground to create shockwaves, while it can also call shulker bullets and a meteor fall. Below half health it enters a second phase in which it regenerates faster, and on death it drops the Ender Spectre, which lets nearby endermen attack whatever the holder chooses.

The Ender Fiend is a naturally generated mob that stays neutral unless attacked first. It can be tamed with Chorus Fruit, after which the player can ride it and command it to sit or follow, and use its Bite, Scream and Stomp abilities. Its maximum health is raised with an Ender Fiend Armor crafted from diamonds and shulker shell, and an Ender Fiend Booster. A baby Ender Fiend hatches from an Ender Fiend's Egg, which is made by right-clicking an adult with an Eye of Ender, and it can be grown up with seven Chorus Fruit.

The mod requires Geckolib and Pehkui and is published for Forge 1.20.1 only. Both the server and every player need it, and the code is covered by All rights reserved, so it is not open source.