You channel positive energy in the form of an orb of prismatic light and use it to blast one target you can see within range. Make a ranged spell attack against the target. You have advantage on this attack roll. On a hit, the target takes 10d8 + 60 radiant damage, or half as much damage on a miss. Hit or miss, the spell ends, and each creature within 10 feet of the target must succeed on a Dexterity saving throw or else take half of the spell's damage. The area sheds bright light in a 40-foot radius and dim light for an additional 40 feet until the end of the caster's next turn. The caster also sheds the same amount of light until the spell ends.

Alternatively, you can choose to gather extra energy before releasing it for the attack. On your next turn, if the spell has not ended, you can use an action to gather even more energy or to make the attack. On your following turn, until the spell ends when the turn ends, you can still use your action to make the attack.

Each time you gather energy in this way, wild beams of prismatic light spill out and strike at five creatures or objects within 60 feet of you. Each target must make a Dexterity saving throw. On a failed save, a target takes 12d6 + 15 radiant damage.

The spell's damage increases by 25 for each turn that you gathered energy. If you gathered energy for two turns and you used your action to make the attack, you also gain advantage on the attack. If the spell ends and you haven't made the attack yet, you can use your reaction to do so with disadvantage, but if you miss, the target takes no damage from the spell.

This spell damages objects within the area of the attack. Any creatures killed or objects reduced to 0 hit points by this spell are reduced to dust.