Casting Time: 1 action
Range: 120 ft
Components: V, S, M
Duration: Concentration
, up to 10 minutes
Damage Type: Radiance
Save: Constitution
Conditions: Blinded
A shimmering wall of bright light appears at a point you choose within range. The wall appears in any orientation you choose: horizontally, vertically, or diagonally. It can be free floating, or it can rest on a solid surface. The wall can be up to 60 feet long, 10 feet high, and 5 feet thick. The wall blocks line of sight, but creatures and objects can pass through it. It emits bright light out to 120 feet and dim light for an additional 120 feet.
When the wall appears, each creature in its area must make a Constitution saving throw. On a failed save, a creature takes 4d8 radiant damage, and it is blinded for 1 minute. On a successful save, it takes half as much damage and isn't blinded. A blinded creature can make a Constitution saving throw at the end of each of its turns, ending the effect on itself on a success.
A creature that ends its turn in the wall's area takes 4d8 radiant damage.
Until the spell ends, you can use an action to launch a beam of radiance from the wall at one creature you can see within 60 feet of it. Make a ranged spell attack. On a hit, the target takes 4d8 radiant damage. Whether you hit or miss, reduce the length of the wall by 10 feet. If the walls length drops to 0 feet, the spell ends.
When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d8 for each slot level above 5th.
Material Component:
a hand mirror
Verbal Component:
Murus di Luminos
Classes: Sorcerer, Warlock, Wizard
Domain: Light
Tags: Damage
Source: Xanathar's Guide to Everything (page 170)
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Other Planes and Effects
Below is information about this spell as it relates to other planes and area of effects (i.e. underwater). Some of the information is pulled official D&D sources (such as books and the twitter feeds of D&D officials), but other information is derived from forums and online discussions. As always, it is up to the DM to decide how they wish to handle spell effects.
Underwater - Verbal Component
Official rules have been verified by Jeremy Crawford - "No rule prohibits verbal components from working underwater. Keep in mind that if you're talking, you're not holding your breath." Hence, while submerged underwater and holding its breath, a creature can cast a spell that requires a verbal component. After casting the spell, if the creature can't breathe underwater, it immediately runs out of breath. The creature can survive for a number of rounds equal to its Constitution modifier (minimum of 1 round).
