Nendermoo

The Nender is a brand new dimension that can be accessed by activating a Destabilizer (recipe in the images tab) along with some Infused Chorus Fruit (recipe also in images) in your inventory. At the moment there isn't much to see other than terrain generation (20 biomes). More content coming soon!

Nethermoos spawn from Unstable Rifts found in the Nether. Don't let their size fool you! They shoot fireballs pretty fast and knock you back if you get too close. Right-clicking them with a bucket allows you to collect Nend Milk.

Endermoos spawn from Unstable Rifts found in the End and will attack on sight. They are fast and, like Enderman, can teleport. Right-clicking them with a bucket allows you to collect Ender Milk.

Unstable Rifts can be found in both the Nether and the End. They will occasionally spit out Nethermoos or Endermoos depending on the dimension it's found in. They will eventually collapse on their own but can be destroyed by hitting it. 

The Minion is a new mini-boss mob that has a 3% chance of spawning when an Unstable Rift is attacked. It will float around and ram into players to damage them, periodically spawning endermites (this will change soon). When killed it will drop a Quantum Sac.