The Nightmare

A three block tall enderman like mob. That is black or a dark shade or purple that stalks like a phantom but behind trees. If see for 5 seconds becomes black particle affects and fly away really fast but stay in the area to stalk. They would be more active night then in the day. One spawn in the day but it is rare. They can also spawn in 4-6 at night. But in the nether they go any where. They have no eyes and attack player, villagers and peaceful mobs. Mojang you can make them drop whatever you guys want.