You may move through objects and creatures as if they were difficult terrain. Ending your turn in a square occupied by an object or creature causes you to be pushed to the nearest unoccupied square and take 1d10 force damage.

You exist on the border between the Ethereal Plane and the Material Plane. Because of this, you can use a Bonus Action to see 60 feet into the Ethereal Plane when you are on the Material Plane, and vice versa for 1 minute. You can do this a number of times equal to your Proficiency Bonus and regain all uses on a Long Rest.

Starting at 5th level, you may enter the Ethereal Plane as a Bonus Action. While here you can see into the Material Plane out to 60ft. You remain there until you come back with a Bonus Action or you drop to 0 hitpoints.

You gain the ability to possess a humanoid within 5 feet of you. The humanoid must succeed a Charisma saving throw equal to 8 + your Charisma modifier + your proficiency bonus or become possessed. You then disappear, and the target is incapacitated and loses control of its body. You now control the body but you can't deprive the possessed target of awareness. You can't be targeted by any attack, spell, or other effect, except ones that turn undead, and you retain your alignment, Intelligence, Wisdom and Charisma scores. You can however be targeted by spells that deal Psychic damage. You otherwise use the possessed target's statistics but you don't gain access to the target's knowledge, class features, or proficiencies. The possession lasts until the body drops to 0 hit points, you end it as a bonus action, or you are turned or forced out by an effect like the dispel evil and good spell. When the possession ends, you reappear in an unoccupied space within 5 feet of the body. The target is immune to your Possession for 24 hours after succeeding on the saving throw or after the possession ends. You regain use of this trait once you have completed a long rest.

Your creature type is undead. You do not require air, food, drink or sleep. You are immune to poison, being poisoned and diseases. Due to your lack of a physical body, you are immune to the state of exhaustion.

Additionally, you are resistant to Necrotic Damage and immune to being Frightened

You don’t need to sleep, and magic can’t put you to sleep. You can finish a long rest in 4 hours if you spend those hours doing light activity such as reading a book or keeping watch.

Also with this, Undead Creatures are not inclined to attack you or be hostile to you unless you provoke them.

You have advantage in death saving throws

When determining your character’s ability scores, increase one score by 2 and increase a different score by 1, or increase three different scores by 1. Follow this rule regardless of the method you use to determine the scores, such as rolling or point buy.

Ghosts retain the size they had in life. Your size is Medium.

Your base walking speed is 30 feet. You also have a flying speed of 30 feet (hover).