Minecraft Mod Issue with Possession

I have downloaded a few mods: Animals Plus, Mo Creatures, Lycanites Mobs, Furniture, Wallpaper, and Twilight Forest. I tried to research the mods before downloading, but I must of missed something. When I go to the Nether, I get picked up and thrown around to my death. When I click on the button that shows the inventory, it says possession followed by a timer, like a potion would have. Does anyone know if this is a regular Minecraft obstacle or if this is from one of those mods? If anyone knows, do you also know how to defeat it?