Caltrop Field

4th-level conjuration

Casting Time: 1 action

Range: 60 feet

Components: V, S, M (a handful of iron filings)

Duration: Concentration, up to 10 minutes

You conjure a 20-foot-radius field of spectral caltrops centered on a point within range. Creatures entering or starting their turn in the area must make a Dexterity saving throw or take 3d8 piercing damage and have their speed reduced to 0 until the start of their next turn. The area counts as difficult terrain.