You form negative energy into a clawed spear of spectral bone which you use to either make one melee spell attack against a target within 5 feet of you or one ranged spell attack against a target that you can see within range. Then the spear vanishes.

On a hit, the target takes 4d8 + 15 necrotic damage, and if it isn't immune to the damage, it must make a Constitution saving throw. On a failure, it falls prone and becomes paralyzed and restrained for the duration. It repeats the saving throw at the end of each of its turns, ending the effect on a success. On a miss, the target takes half as much damage and suffers no other effects from the spell.

A creature cannot be paralyzed by this spell if it is immune to disease or cannot be magically aged. 

At Higher Levels. When you cast this spell using a spell slot of 8th level or higher, the damage dealt increases by 2d8 for each slot level above 7th.