Time's Misfortune

You begin to siphon the seconds away from someone's lifetime. Make a melee spell attack against a creature within your reach. On a hit, the target takes 4D12 force damage, their movement speed is halved until the end of their next turn, and you can take the disengage action for free immediately after this attack. 

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1D12 per spell slot above 3rd level.