nightwalkers (always remaining alert of your surroundings)

this non-humanoid entity can only been seen at night or in dark area such as dark oak forests 

they are hostile to you or any other hostile mobs including illagers if they is a full moon or no moon the rest of time the entity will either be watching you, learning from you which is where get their IQ from or the entity will be hunting the player's location but they temporally disappear in sunlight          

strengths: A nightwalker's attack speed is the same speed as a player but it's movement speed is the same as an endermen when he is in attack mode, the nightwalker's IQ on the other hand doesn't stay the same it increases every time it attacks just like the player's IQ, but like the player which can equip armour and weapons the nightwalker can as well but it takes the nightwalker longer, the nightwalkers are immune to all potions which can do damage   

weakness: the nightwalker cannot appear in sunlight or near soul touches, the nightwalker cannot craft but can loot villages or try to break in to your base to loot what it can to use against you (if they IQ is high enough), can be detected if they walk on soul soil 

nightwalker's drops: iron sword (common), different types of armour pieces (how common the types it drops depends on what armour you killed the nightwalker with) (for an example if you killed a nightwalker with a armour made out of a very rare ore it's more likely going to give you a common type of armour piece drop but sometimes it may not drop anything but XP)