Bellevex

Bellevex is a demonic creature that roams the earth. Its main form is a black cat, know one has lived to tell the tale of its natural form. Bellevex roams the world singling out people, can only be seen by one person at a time, they get to chose who sees it. Its best to be nice to this entity to survive, if not as soon as it decides it will kill you it will disappear for one day, when it comes back it will chase you until you are dead, nobody else will see it chase you and it cant be hurt.