Charisma OR Wisdom score increases by two (2). 

Can see in the dark, up to 40ft away. However, all colours are muted, and closer to greys and blacks than their true colour.

Able to fly up to half of your walking speed, rounding to the nearest five.

The ghost can see 60 feet into the Ethereal Plane when it is on the Material Plane, and vice versa.

Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 17 (4d6 + 3) necrotic damage.

Each non-undead creature within 60 feet of the ghost that can see it must succeed on a DC 13 Wisdom saving throw or be frightened for 1 minute. If the save fails by 5 or more, the target also ages 1d4 × 10 years. A frightened target can repeat the saving throw at the end of each of its turns, ending the frightened condition on itself on a success. If a target's saving throw is successful or the effect ends for it, the target is immune to this ghost's Horrifying Visage for the next 24 hours. The aging effect can be reversed with a greater restoration spell, but only within 24 hours of it occurring.

You gain the ability to possess a humanoid within 5 feet of you. The humanoid must succeed a Charisma saving throw 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 retains your alignment, Intelligence, Wisdom and Charisma scores. 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 [DC your 10 + WIS mod] or after the possession ends. You regain use of this trait once you have completed a long rest.

 As a bonus action, you may step into the Ethereal Plane, becoming incorporeal. While incorporeal, you loose the ability to realize any physical actions, such as basic/weapon attacks, and you become resistant to non-magical damage from creatures in the material plane. As a bonus action, or if reduced to 0 hit points you re-enter the Material Plane.