choose an ability score to increase by 2 and a score to increase by 1.

You have continue to endure, even in death. A fact represented by the following benefits:

• You have advantage on saving throws against disease and being poisoned, and you have resistance to necrotic and poison damage.
• You have advantage on death saving throws.
• You don’t need to eat, drink, or breathe.
• 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 in an inactive, motionless state, during which you retain consciousness.

Even after death, your elven reflexes have not diminished. You can move with such grace, it seems as if you are gliding across the ground without leave a trace of your presence. 

Your movement speed increases by 5 and you have advantage on stealth checks as long as you are not wearing medium or heavy armor.

At 3rd level, you can utter the baleful banshee Shriek.

All creatures within 15ft of you, or within a 30ft cone in front of you must make a Constitution save (DC= 8+Proficiency+Con). On failure, the targets take thunder damage equal to 2d6+your character level, or half as much on success and are frightened of you for 1d4 rounds. Creatures that are immune to charm and fear effects are not subject to the frightened effect.

You may use this feature twice, regaining all uses after a short or long rest.

Banshee's can sense the beating hearts of living and injured creatures.

With an action you can hone your supernatural senses, concentrating to detect the heartbeat of any humanoid within 50ft of you for up to 1 minute. While you are sensing creatures in this way, you can use your action to see faint auras around living targets and determine if the targets are healthy, injured or dying.

Once you use this ability, you must finish a short rest before you can do so again. 

At 5th level, Forsaken Banshee learn to focus their rage, allowing themselves to tap into the supernatural aspects of their accursed being that they would normally have if they did not choose to inhabit a physical body. With an action, you shift your form into a shadowy spectral form gaining the following benefits:

• You gain a 40ft flying speed.
• Whirling shadows dim all light in a 10ft radius around you.
• Once on each of your turns when you damage a target, you can add 1d8 additional necrotic damage.
• You regain a use of your Shriek feature if you slay a living target with it while your fury state.

After your fury subsides, you must finish a long rest before you can use it again.