Frightful[]
Frightful is a new dimension where 8 mobs spawn : Evil Chicken, Evil Cow, Evil Pig, Evil Sheep, Ghost, Vampire and Mummy.The first access in Frightful start the Apocalypse.
Portal[]
To access to this dimension, you will create a portal with Nether Brick and activate with a Blood Bottle. You need create this portal in the Overworld, portal don't works in an another dimension.