Cloud of Daggers

Bard    Sorcerer    Warlock    Wizard

Level 2 Conjuration

Casting Time: 1 action
Range: 60 feet
Components: V, S, M (a sliver of glass)
Duration: Concentration, up to 1 minute

You fill the air with spinning daggers in a cube 5 feet on each side, centered on a point you choose within range. A creature takes 4d4 slashing damage when it enters the spell's area for the first time on a turn or starts its turn there.

At Higher Levels: When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 2d4 for each slot level above 2nd.

Source: Player's Handbook, p. 222