Wall of Light

5th-level evocation

Casting Time: 1 standard action
Range: 120 feet
Components: V, S, M (a chip of mica)
Duration: Concentration, up to 10 minutes
Classes: cleric, druid, sorcerer, wizard

An immobile, blinding curtain of white light that blocks line of sight springs into existence. You can make the wall up to 60 feet long, and 20 feet high, or a ringed wall up to 20 feet in diameter and 20 feet high. The wall blocks line of sight. The wall sheds bright light to a range of 60 feet in all directions and dim light for an additional 60 feet.

A creature that is adjacent to the wall must close their eyes or make a Constitution saving throw; on a failed save, the creature is blinded until the end of their next turn. A creature that passes through the wall is automatically blinded, even if its eyes are closed. An undead that fails a saving throw has their maximum hit points reduced by 5; this reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0. An undead that passes through the wall must make a saving throw to avoid this effect even if its eyes are closed.