"A dark biome has summoned"
The kronos biome has served MCCPS since the beginning. You can find many valuable items in this rare biome. But before this biome spawns, you need to defeat Kronos's sidekick, Endy. After, you can find this rare biome somewhere in your world. Go to the middle where the Nether Brick pillars are located, and jump into the hole with the pressure plates. This will teleport you to the boss area, where you will fight Kronos himself.