Spikes
Conjuration cantrip (Artificer, Druid, Wizard)
Casting Time: 1 action
Range: 30 feet
Components: V, S
Duration: Concentration, up to 1 minute
You can spread Caltrops that cover a 5-foot-square area within range. A creature that enters this area for the first time on a turn must succeed on a Dexterity saving throw or take 1 Piercing damage and have its Speed reduced to 0 until the start of its next turn.
Cantrip Upgrade. You can cover an additional 5-foot-square when you reach levels 5, 11, and 17 (3d6).