As an action, you have resistance to radiant damage for the duration.
You can target one additional willing creature that you can touch or see within 10 meters for each additional mana expended. The creatures must be within 5 meters of each other when you target them.
Immunity. You can expend 2 additional mana so the creature is immune to radiant damage.
Dampen the Light
As a reaction, which you use when you take radiant damage, you gain resistance to radiant damage until the start of your next turn.
You can expend 1 additional mana to trigger the spell when a creature that you can touch or see within 10 meters takes radiant damage. The creature gains the resistance instead.