You create a spectral sword that hovers within range. It lasts for the duration.
Mordenkainen's Sword
Level 7 Evocation · Concentration
Casting Time1 action
Range90 feet
DurationConcentration, up to 1 minute
Components
V, S, M
Spell Description
When the sword appears, you make a melee spell attack against a target within 5 feet of the sword. On a hit, the target takes Force damage equal to plus your spellcasting ability modifier.
ForceOn your later turns, you can take a Bonus Action to move the sword up to 30 feet to a spot you can see and repeat the attack against the same target or a different one.