If you the one who liked scary thing and challenging to play in your survival world, then this add-on is for you it added the scariest mobs and extremely creepy mobs into your game.This boss mob is really tall, the height of it's about 17 blocks.

Cartoon Cat: he can do the things no mob in Minecraft can do, extremely hostile.
He is really stretchy so he can travel fast with his stretched body.
He can change his size depend on his enemy or when his enemy is flying.
His health is the date he got discovered in the wiki.
Warning this one is creepy he could go away and return.
He can grow more hand to help him fight everything.

Siren Head:
Health: 8000
Damage: 20
Will attack players and villagers
Can knock player away
Siren head will pick the player and other mob if it think it can
Siren head can also throw it enemy
Siren head will use soundwave
Can spawn naturally in taiga biome at night, but the chance for it to spawn is very rare
Will change it skin when the night fall
It's very hard to see when it's in the dark
The only way to defeat siren head is ranged weapon
The Boss version will have more skill than the normal one
Health of the boss is the date siren head was discovered

Disclaimer: This is an unofficial app for Minecraft Pocket Edition. This app is not affiliated in any way with Mojang AB. The name, brand and assets are the property of Mojang AB or its respectful owner.