Once I was playing minecraft I made a new world and I went out to get some wood. As I was walking I heard footsteps behind me. I looked back and saw nothing... I was in fear. I don't know why i just was... I started walking back to my house and thats when I saw it.. a player shaped mob with the numbers "999" above its head. It was completely blue and it looked very weird. I tried to fight it with my new wood sword but it was not damaging but MY wood sword broke. 1 month later i found some diamonds. Created armour, traded stuff, made enchanted diamond swords. I found this guy again and he killed me and my pets even he didn't hit me. Even my pets. I thought it was a Mod.