A green bolt flies from your hand wrapping around the torso of the target. Make a ranged spell attack against that target. On a hit, the target takes 2d10 force damage and wraps around the target.  While the target is wrapped, whenever another attack hits roll an additional d10 force damage, and all damage dealt to this target is turned into force damage. 

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the initial damage increases by 1d10 for each slot level above 2nd. The damage from the additinal d10 increases every 2 slot levels above 2nd.