You use your own vitality to shield another creature of your choice. You can suffer 2d12 necrotic damage and lower the amount of damage that an ally will receive by the same amount. The received damage can't be resisted in any way.

When you cast this spell using a spell slot of 3rd level or higher, The amount of force that you can stop and the amount of sacrifice that you have to make is increased by 1d12 for each slot level above 2nd.