Aliens will be rare mobs that secure a UFO base on the sides of a extreme hill sides. Aliens will try to kill you and shoot you. Aliens always carry laser guns. Aliens have 30 hearts and baby aliens have 15. If killed they drop an iron chestplate or rarley 0 - 2 diamonds or both. Aliens have a queen. The queen is 3 blocks high and she can teleport. Basically, the queen is an enderman. If the queen sees you she will shoot you. Her laser gun damages 9 1/2 hearts of life.