Vampiric waltz

You imbue your body whit necrotic power and attempt to hold and start a dance whit a creature that you can see whithin meele range 

The target must suceed a dexterety savinthro on a failure they take 10d8 necrotic damage and are restrained half as much on a success and no addictional effects the dance fail to begin and the spell ends. 

Each turn while the enemy are restrained it takes an adictional 5d8 necrotic damage you regain hitpoints equal to half of the damage dealt. 

The creature can use their action to attempt to excape from your dance whit a Strength or Dexterety savingthro agains your spell DC on a sucees they are no longer restrained and the spell ends.

At higher levels: each level above 4th the spell deal more 2d8 necrotic damage and 1d8 on more on the extended damage