Deaths Reach

you raise your hand and any creature within 60 feet of you that you can see, has to succeed a CON saving throw of 18 or they will loose 10d12 Necrotic damage, any creature that succeeds on a saving throw recieves half damage.

Any creature medium to tiny will die instantly if failed saving throw.

With deaths will, i will reach into the abyss, and cast darkness over you.
With deaths will, i shall blacken the skies, and darken the earth.
With deaths will, life shall end, and everything will fade.

(Casting this spell will remove 1 hit dice from your total until you take a long rest, may only be cast when you have available hit dice.)