Sunbeam Dagger

Weapon (dagger), rare (requires attunement)
This is a magical dagger. All attack and damage rolls made with this weapon get +1.
During the day, this dagger appears normal and has no special qualities other than the magical bonus above. At night, you may speak a command word and the blade will immediately begin to emit golden light and warmth. All attacks made with the blade while this effect is active do an additional 1d4 radiant damage.
Bane of Undead: This weapon despises the undead. If an undead character attempts to wield it, they are unable to use its command word. Furthermore, they take 1d4 radiant damage every time they attack with the dagger.

Sunflame Dagger by Darla-Illara

Item type

Weapon, Melee