Vaudriel's Sacred Light

There are three forms to this spell. The ritual; which requires the offering of a 500 gp diamond and has a casting time of 10 minutes + 1 minute to preform, the conjuration; requiring the diamond in concert with verbal and somatic components, having the casting time of 1 action, and the evocation; which requires the caster to possess a binding contract of mutual benefit with the celestial Vandiel, the Deathpact Angel via means of a contact other plane spell or a planar binding spell, which can be cast with only a verbal component as either a reaction, bonus action, or "quickened" action.

Upon completion of the spell, a glyph of glowing celestial runes springs forth expanding outward from you to form a magic circle 100-foot in diameter, with you at its center. In a instant the area (a 100-foot diameter by 100-foot tall cylinder) becomes filled with a tower of celestial light. Each creature who is not an ally that is within the area is blinded until the end of your next turn, and must make a Dexterity saving throw. A target takes 10d6 radiant damage, and the next attack roll made against the target before the end of your next turn has advantage, (thanks to the mystical dim light glittering on the target until then.) on a failed save, or half as much damage, and the target is not illuminated, on a successful one.

Undead or fiendish targets are at disadvantage when making a Dexterity saving throw against the sacred light and sustain double damage from the spell.

Any ally who is within the area is bolstered and rejuvenated by the sacred light. Those allies are healed for 10d6 hit points and may end a single active negative condition they might be suffering under if such a condition exists. (This can not remove magical diseases such as mummy rot or lycanthropy which require multiple conditions removed to cure.)

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage and healing increases by 1d6 for each slot level above 5th.