Force weapon

Evocation cantrip
Casting Time: 1 action
Range: 5 feet
Components: V, S, M (a specially-prepared gauntlet
worth at least 5 gp)
Duration: 1 round
You conjure a blade of magical force in the air, which
lashes out at your foes. Make a melee spell attack. On
a hit, you deal 1d10 force damage. The blade remains
in existence for a short time; until the beginning of
your next turn, you can make a single strike with
your mystical blade as an opportunity attack.
You can make 1 additional attack on your turn
at 5th level (2 attacks), at 11th level (3 attacks), and at
17th level (4 attacks).