Yes, older hmod herobrine plugin was awsome, but I do realize how hard it is to make a AI good enouth for not being a joke. And I do realize people wont spend lots of times for doing a "fun" plugin. My idea for a herobrine is much more simple and easy. A configurable random counter, when it reaches the time, a "Monster" mob is spawned semewhere near a player, preferably only if light is low enouth. I have being doing this manually on my server using tp, spawnmob and vanish, and I can tell, people get scared