Divert Damage

When a Creature within 120ft of you would take damage, you can use your reaction and split the damage between the original creature and one other creature within range, each of them takes half the damage before any resistances, vulnerabilities or immunities are applied, the damage for both is rounded down. If the target you are splitting the damage with is willing it just happens, if the target it not willing it must make a Constitution Saving Throw, on a fail it takes half the damage, on a pass the original target takes the full damage.

At Higher Levels: You may split the damage between an additional target for each spell level above second, each of these creatures that are not willing makes a Constitution Saving Throw, the Damage is split between all creatures that failed and the original creature.