This data pack adds Herobrine into the game. Herobrine will rarely appear around a player, just staring at them. If he is seen, he will vanish in a puff of smoke. He will NOT grief your world in any way, just stalk you and give your world a spooky vibe.
Don't know how to install data packs? Watch this video
This data pack NEEDS to be used with this resource pack: HERE
Additionally, the files of the data pack have many comments in them, so you can easily change some settings regarding herobrines cooldown, appearence, etc...
Showcase video: