Casting Time: 1 bonus action
Range: Touch
Components: V, S
Duration: Concentration
, up to 1 hour
Damage Type: Radiance
Save: Constitution
Conditions: Blinded
You imbue a weapon you touch with holy power. Until the spell ends, the weapon emits bright light in a 30-foot radius and dim light for an additional 30 feet. In addition, weapon attacks made with it deal an extra 2d8 radiant damage on a hit. If the weapon isn't already a magic weapon, it becomes one for the duration.
As a bonus action on your turn, you can dismiss this spell and cause the weapon to emit a burst of radiance. Each creature of your choice that you can see within 30 feet of you 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, a creature takes half as much damage and isn't blinded. At the end of each of its turns, a blinded creature can make a Constitution saving throw, ending the effect on itself on a success.
Verbal Component:
Imbuo Arma Cuum Potens Sanctus
Classes: Cleric, Paladin
Tags: Damage, Debuff
Source: Xanathar's Guide to Everything (page 157)
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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).
