Bloody Briar Patch

Call upon the sins of the past to conjure a patch of razor-sharp, blood-red, crystalline briars. 

A patch of these briars blooms, centered on a point within sight and range with a 20 foot radius sphere on the ground. The area becomes Difficult Terrain for the duration. Any creatures that start their turn within this area or upon entering this area for the first time on their turn must take 1d6 Piercing Damage and 1d6 Fire Damage. Creatures that move within this area take 2d4 Piercing Damage and 1d4 Fire Damage for every 5 feet they move through the briar patch.

The briars may be dismissed as a free action on your turn. The caster takes half damage from this spell

Using a Higher-Level Spell Slot. The fire damage is increased by 1d6 and 1d4 respectively, and the piercing damage is increased by 1d6 for each spell slot level above 2. If cast with a level 4 or higher spell slot, the spell no longer requires concentration.