The fog monster is a gigantic Herobrine edited in a video with Adobe CS5 there is not much info about it but its hostile and it seems like its trying to grab you. The swamp monster was basically the same thing a giant Herobrine but in the swamp monster video instead of reaching down to the user who recorded the video his friend was playing with him when suddenly the swamp monster appears and launches him at the user who recorded. the video the mobs were created by user d74g0n in 2011