DISCLAIMER: THIS STILL HASN'T BEEN MULTIPLAYER TESTED
This is one of the very few Herobrine mods out there that actually replicate his original motives and behavior from the creepypastas and sightings. Basically this mod is to make you feel like you're not alone, and you have an unwelcome visitor in your world. This Herobrine ranges from building unnatural things in your world to stalking you everywhere you go. Sometimes he will run away when you chase after him, or even disappear without a trace by looking at his direction, so you may miss him if you don't pay attention. The things he will do to your world are perfect sand pyramids in the oceans or rivers, mine long 2x2 tunnel pathways in caves, and cut leaves off of groups of trees when you're in or near a forest long enough. There will also be randomly placed cobblestone, mined trees (trees without logs,) and signs with very short messages like "Stop" or warnings in Swedish. The last thing to mention is that he will follow you into the nether and start watching you and taking nether warts off of mushroom trees, and make 2x2 tunnels there. That is all for now. I will update the mod in the future.