I had recently spawned a new world in single-player Minecraft. Everything was normal at first as I began chopping down trees and crafting a workbench. I noticed something move amongst the dense fog (I have a very slow computer so I have to play with a tiny render distance). I thought it was a cow, so I pursued it, hoping to grab some hides for armor.

It wasn’t a cow though. Looking back at me was another character with the default skin, but his eyes were empty. I saw no name pop up, and I double-checked to make sure I wasn’t in multiplayer mode. He didn’t stay long. He looked at me and quickly ran into the fog. I purused out of curiosity, but he was gone.

I...