Incorporeal creatures are creatures the primarily reside on the ethereal plane making them hard to interact with for anyone on the material plane.
“ Shadow demon (Creature) Type Outsider (chaotic, demon, evil, extraplanar, incorporeal) CR 7...Shadow demon
“A ghost is the spirit of a mortal creature which for whatever reason cannot, or will not leave...Ghost
“Danse macabres are morbid specters of the final fate which awaits every mortal. They appear as...Danse macabre