You are sustained by the necromantic energy that raised you from death.Your body is no longer affected by disease, poison or the poisoned condition. You don't require air, food, drink, or sleep. You have advantage on saving throws against exhaustion, but you do still need rest. Instead of sleeping, when you take a long rest, you enter an eerily still period of inactivity of at least 4 hours a day. During this period, you do not sleep or dream; you are not rendered unconscious, and you can see and hear as normal.

You can gain or regain hit points through a short or long rest, or magically through the following spells: Aid, Aura of Vitality, False Life, Life Transference, Negative Energy Flood, Regenerate, Vampiric Touch, or Wish.

Your size, height, and base walking speed remain same as the original race, but you lose any special movement speeds such as swimming or flying. You retain your skill and tool proficiencies, and any language you spoke in life. You can retain your personality and alignment, and memories of your past life, though they are often incomplete and hazy.

Note: If the speed your previous speed isn't showing as an option you have to set it manually in the sheet. (click on the walking speed in the top middle and customise it there.)

Your Strength score becomes 7. Your Charisma score increases by 3, to a maximum of 20.

Note: I couldn't figure out how to set the strength score to 7, so you will have to do that manually. (Go to character builder, click on Abilities, scroll down a bit until you see the bottom of the strength calculations, write 7 in the overwrite score part, now make sure you put it on strength and you're done)

You gain resistance to acid, fire, lightning and thunder damage, as well as attacks from non-magical bludgeoning, piercing and slashing attacks. You are also immune to cold damage. It is also impossible to grapple you, knock you prone, or otherwise restrain you. You can still manipulate objects, open unlocked doora or containera, stow or retrieve an item from an open container, or pour the contents out of a vial. Although you may appear as though you have the equipment you had in life, you can't wear or gain benefits of armor, wield weapons, or activate magic items, or carry more than 10 pounds. 

You exist on the border between the Ethereal Plane and the Material Plane. Because of this, you can see 60 feet into the Ethereal Plane when you are on the Material Plane, and vice versa.

Your spectral nature means you are always floating, or flying. You gain a fly speed of 50 feet.

You can move through other creatures, objects and non-magical physical barriers as if they were difficult terrain. You take 1d10 force damage if you end your turn inside an object. If you end your turn inside a physical barrier, you take 2d10 force damage and are ejected to the nearest free space.

You might appear to attack with your hand, or what looks like a sword or axe, but the effect is always a Withering Touch. Your weapon attacks are replaced with this feature, and your unarmed strikes now deal necrotic damage. As an action, you make a melee touch attack and deal Necrotic damage equal to 2d6 + your Dexterity modifier. This damage increases to 3d6 at 6th level, 4d6 at 11th level, and 5d6 at 16th level. 

Each non-undead creature within 60 feet of you that can see you must succeed on a Wisdom saving throw equal to 8 + your Charisma modifier + your proficiency bonus 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 feature for the next 24 hours. The aging effect can be reversed with a greater restoration spell, but only within 24 hours of it occurring.

Once you use this feature, you can't use it again until you finish a short or a long rest.

You can move to the Ethereal plane to bypass barriers and obstacles on the Material Plane with ease. As an action you can enter the Ethereal Plane from the Material Plane, or vice versa. You remain visible on the Material Plane while in the Border Ethereal, and vice versa, yet you can't affect or be affected by anything on the other plane.

 You can target one humanoid that you can see within 5 feet of you. The target must succeed on a Charisma saving throw equal to 8 + your Charisma modifier + your proficiency bonus or be possessed by you; you then disappear, and the target is incapacitated and loses control of its body. You now control the body, but this doesn't deprive the 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. You otherwise use the possessed target's statistics, but 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 cannot use this feature again until you finish a long rest.