Blessed Light

When you cast this spell, you touch a single weapon, granting it the power to fight and banish otherworldly forces. For the duration, attacks made with the weapon deal an additional 1d6 necrotic or radiant damage, your choice. This damage is not subject to damage resistance. This additional damage increases to 2d6 against aberrations, celestials, elementals, fey, fiends, and undead. Additionally, if the enchanted weapon makes a critical hit against one of these creatures, the target of the attack must succeed on a Charisma saving throw or suffer the effects of the banishment spell, with the exception that you do not need to maintain concentration for this spell. When you cast this spell as a ritual, the duration becomes 1 hour.