You can add biomes that is found in the End in here.

name description rarity items mobs
Enderhills Extreme hills biome, but made out of endstone common

Ender particles,

Enderide, Endstone

Endermen, Ender-zombies, Ender Soldiers, Enderknights
Dragon's Nest Mini-Biome made of bone cluster blocks, endergoo oozes around Extremely


bone equipment,

hardened endergoo ingots , enderman


Endermen, endermites, baby dragon trio boss
Ender Castle the place is extremely dangerous so you need stronger than diamond armor. Super rare Ender bricks, Ender fences, Endermen spawners, Dragon eggs. Ender King,


Ender builder, Ender cook.