Wall of Fire

Level 4 Evocation (Druid, Sorcerer, Wizard)
Casting Time: Action
Range: 120 feet
Components: V, S, M (a piece of charcoal)
Duration: Concentration, up to 1 minute

You create a wall of fire on a solid surface within range. You can make the wall up to 60 feet long, 20 feet high, and 1 foot thick, or a ringed wall up to 20 feet in diameter, 20 feet high, and 1 foot thick. The wall is opaque and lasts for the duration. When the wall appears, each creature in its area makes a Dexterity saving throw, taking 5d8 Fire damage on a failed save or half as much damage on a successful one.

One side of the wall, selected by you when you cast this spell, deals 5d8 [[Fire damage] to each creature that ends its turn within 10 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. Using a Higher-Level Spell Slot. The damage increases by 1d8 for each spell slot level above 4.