Disappearing Strike

The first time you hit with a weapon attack during this spell’s duration, your weapon fades from sight, and the attack deals an extra 3d8 force damage to the target. Additionally, after hitting the target, at the end of your turn, you become invisible until the spell ends, or until you attack or cast a spell. 

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 for each slot level above 3rd.