Ring of Fire

Wondrous item, rare

You draw a circle in the ground using this ring up to 20 feet in diameter and a ring of fire 5 feet high and 1 foot thick bursts forth.

When the wall appears, each creature within its area must make a DC 10 Dexterity saving throw. On a failed save, a creature takes 1d8 fire damage, or half as much damage on a successful save.

One side of the wall, selected by you when you cast this spell, deals 1d8 fire damage to each creature that ends its turn within 5 feet of that side or inside the wall. A creature takes the same damage when it enters the wall for the first time on a turn or ends its turn there. The other side of the wall deals no damage.