Concussive Watchstrike

You generate a wave of radiant force from your watchblade toward an opponent. The attack deals 1d6 radiant damage to the target, and the target must make a dexterity saving throw, at a difficulty of the Watcher's spell save DC. On a failure, the target is moved back a distance equal to the range of a watch strike and is knocked prone. on a Success, the target is moved back 5 feet. 

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the extra damage increases by 1d6 for each slot level above 1st.