A beam of either light or darkness (your choice) streaks toward a target, piercing everything in its path. Developed by an archdemon, it exists partially on the etherial plane in order to circumvent protection against it.

This spell can hit creatures on the etherial plane, so long as it is being cast on one of the inner planes. Make a ranged spell attack against a creature within range that you can perceive. The target takes 3d6 radiant or necrotic damage, radiant if you chose light, necrotic if you chose darkness.

The target gains no benefit from cover, and its AC is treated as 10 for the purpose of determining whether or not this spell hits it. A creature is immune to all damage done by this spell while under the effect of the Shield spell, as well as if they cast it in reaction to this spell.

At higher levels:
When you cast this spell with a spell slot of 3rd level or higher, it deals an additional 2d6 damage for each slot level above 2nd.