Charm

You place a protective charm on a creature other than yourself that you can see within range. Until the spell ends, whenever the target takes damage, roll 1d4. The damage is reduced by the amount rolled. Also, choose one ability when you cast the spell. The target cannot gain disadvantage on ability checks made with the chosen ability.

If the target is reduced to 0 hit points but not killed outright, they are instead reduced to 1 hit point, you take necrotic damage equal to the amount of damage prevented, and the spell ends. If the spell ends this way, the material components used for this casting are consumed. 

At Higher Levels. When you cast this spell using a spell slot of 3rd or 4th level, you can maintain your concentration on the spell for up to 10 minutes. When you use a spell slot of 5th level or higher, you can maintain your concentration on the spell for up to 1 hour.