Deathforce Thornfield v1.5

7th Level Boundary Domain Spell

All surfaces around you are covered in an aura of thorns that extends 5ft from the surface. When any creature you choose moves within range of the field they must succeed a Dexterity Saving Throw or have their movement/flying/swimming speed reduced by 10ft and take 1d12 damage per 5ft traveled through the field. If they succeed on the Saving Throw their movement speed is only reduced half as much and they take half damage. The field fades to nothing at the start of your next turn.

At Higher Levels: When you cast this spell with a Spell Slot at higher levels, damage is increased by 1d12 for every two Spell Slot Levels above the 4th.