Player can choose to pass through physical objects at will. This also means if wearing clothing that part of the body becomes tangible in order to allow the clothing to stay and not pass through their body. when an attack is made of tangible part player must roll a DEX save in order to see if they switched back in time. 

This trait can be passed to anything that the ghost can physically touch and stops once the ghost removes their contact with the object. This can also work for people but once they are intangible they can hear the sound of the dead. The player that is granted intangibility must roll wisdom saving throw of 8 plus their intelligence. 

This gives +2 to wisdom and +1 to dexterity. 

 you are resistant to necrotic damage.

This gives an advantage on stealth and intimidation when in their intangible form.

You can make your body fall apart and dissipate, allowing you to go close to invisible, you can do this as a bonus action, and you roll as if you're going into stealth with advantage against any creatures who aren't undead. Once you are in this state successfully, you can not be seen by any creatures even if they were to cast detect invisibility or use a perception check, only three things can cause you to go out of this state: Getting hit with a spell, deactivating it during your bonus action, or if you physically attack someone(TBD)