Ghosts are very good at keeping secrets and being unnoticed.

They are good and bad because somewhere murdered and will not stop holding grudges.

They have a blue or white glow on them

castle  Surnud grand (prize for which language and word)

powers -going through walls and doors

                       levitating things

                         invisible

                                helpful advices

                                  possesion

Weakness-    you can trap a ghost if you surround it with stones all different to each other