The Nightmare

Even for a barren dimension... the end feels a little lacklustre.

The nightmare is a new hostile mob, loosely inspired by the original phantom and the illager beast, it spawns on end islands where chorus is found. It is hostile, however it has a moderate chance to be uninterested in you unless you are somewhat close, breaking chorus plants will assure its interest in you.

 

It has 3 attacks:

Ram: It will ram into you, similarly to a illager beast running over crops, if its not in range to do the other attacks, it will do this.

Venom: It will open its mouth and spit it at you, this is similar to llama, but the spit blinds and poisons you, if it is not in range to swing its club or you are in the air (elytra),
it will do this.

Club: It uses its tail as a mace, doing fatal damage.

The nightmare and its nightspores, concept art by me. I have the assets, if anyone wishes to use them for anything.

Why even go near it?

It drops 1-3 nightspores, which can be used for plenty of things.

Black dye- The palette actually takes 1 or 2 colors from black dye, each nightspore makes 3 black dye, if you spend more time in the end than the water, this might be pretty useful.
Ram Potion- Sprinting into enemies will knock them back, for neutral mobs, this will enrage them, brewed with nightspores. Level 2 does more knockback.
I don't know if this enough in terms of the drops category, but if anyone else has some ideas for nightspore uses or another drop, feel free to tell me!

 

What's the overall purpose?

To fill the gap the phantom left, a hostile mob in the end, the end currently feels too empty, even for a wasteland and too peaceful, there's also no incentive to not break chorus flowers, an infinite food source which also make decent building blocks and as of 1.14, can be used for bow minigames.