The Claw

Nobody knows the beginning of how "The Claw" came into existence, but we know that it exists since the beginning of time. Nobody understands the claw, but we do know that it does wake up and sleep every now and then - without notice and without any particular cycle. The claw definitely needs a host to survive but we do know that it doesn't eat or drink. It is hard to figure out if the claw is alive, but it surely has feelings.

And there is one thing about a magic sequence of words that invites the claw as your guest - "Hi Claw! If you are listening to me please leave this hand!!" This innocuous sentence actually ends up inviting the claw to you.