Blood Sacrifice

When you cast this spell, expend and roll half of your total hit dice. You lose health equal to the total you rolled as blood explodes from your body. Your magic infuses with the blood as it is absorbed into the ground, bursting forth from the ground shortly after as a large bear trap. Choose a creature you can see within range. That creature must make a Dexterity saving throw. On a failed save, a creature takes piercing damage equal to 4d10 plus the health you lost when you cast this spell, or half as much damage on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d10 for each slot level above 4th.