Trickster: A new hostile mob. It will trick you by luring you to places. When you are mining he might make you see diamonds instead of lava. It's very hard to deal with. It also attacks villagers and iron golems snow golems. It has 20 hp.when you kill it you might have a chance if getting a trickster head. If you wear it you will be immune to their illusions. You will hear a sound when the head blocks the magic. You can't use it forever. It has a durability.
Octopus: passive mob .It has 10 hp but it can camouflage. It can also spray ink like squids. After death it might drop octopus skin. You can use it to craft a leather like armour but you can camouflage. No mobs will notice you. For it to work you have to sneak .
Demon: hostile mob. It will attack very quickly. It has 30 hp. It's attacks are very strong. It can shoot dark fire from far away. And if the entity is close to you he will use melee attack. He will drop dark fire charge. (Stronger than fire charge)
Lava monster: it lives in the lava . But once in a while it will come on land . It has 50 hp . Same size of a ghast . Shoots ranged tentacles. Upon death will drop tentacles. Decorative placed as trophy.