The Eye of Dawn

Weapon (morningstar), very rare (requires attunement)

Gold-plated morningstar with curved barbs in the form of a sunburst.

You gain a +1 bonus to attack and damage rolls made with this magic weapon. When you hit a fiend or an undead with it, that creature takes an extra 1d6 radiant damage.

While holding the weapon, it creates an aura in a 10-foot radius around you. You and all allies in the aura have advantage on Perception checks to locate hidden or invisible creatures.

When you hit a target with a melee weapon attack, you can call upon the power of Gwaire, God of the Sun, to ignite a burst of brilliant sunlight upon your target, which must make a DC 15 Constitution saving throw. On a failed save, the target takes 3d6 radiant damage and is blinded for 1d4 rounds. On a successful save, it takes half as much damage and isn’t blinded. Undead and fiends have disadvantage on this saving throw.

A target blinded by this effect makes another Constitution saving throw at the end of each of its turns. On a successful save, it is no longer blinded.

You cannot use the radiant sunburst ability again until dawn on the following day.