Blood Surge

You choose a creature you can see within 30 feet and heal them a number of hit points equal to 4 of the targets hit dice. The target must make a Constitution saving throw with a difficulty rating equal to half of the hit points recovered rounded down. On a failure, the target is stunned until the end of your next turn.

If the target is multiclassing, they can only benefit from a number of hit dice equal to the number of levels they have taken in that class.

At Higher Levels. When you cast this spell at a higher level, you can roll one additional die per level above 3rd.