Nystul's Radiant Arch

This spell creates a glimmering rainbow of light that arches between the caster's open hands. Once the rainbow takes form, the caster can choose to fire a ray 1 foot wide from the rainbow, aimed at one creature up to 10 feet away per level of the wizard. The ray can take the form of one of the seven colors of energy drawn from the Quasi-Plane of Radiance.

Red: cold energy (+1 damage to fire-based creatures, no damage if cold-based);

Orange: heat energy (+1 damage to cold-based creatures, no damage if fire-based);

Yellow: acid damage (save vs. spell to take no damage);

Green: neutralize poison (as 4th-level priest spell)

Blue: electrical energy (+10 points of damage to a metal armored enemy)

Indigo: undead specific (only undead are harmed)

Violet: vegetation specific (only plant-based life, including fungi and molds, are harmed)

The ray inflicts 1d6 points of damage per level of the caster, to a maximum of 15d6. The type of damage corresponds to the color of the ray, and the creature is allowed a saving throw vs. spell for half damage.

The wizard must concentrate to keep the radiant arch active, so any attack that breaks the caster's concentration will dispel the rainbow and prevent the caster from launching a ray. One ray can be fired each round.

The material components are a crystal prism that shatters at the conclusion of the spell and a small black board with a pinhole through the center.