Vital Sacrifice

Prerequisite: —

You've learned secrets of hemocraft that grant you esoteric power at the price of your own life force. As a bonus action, you can choose to take dice: 1d6 necrotic damage to gain a blood boon. Your blood boon lasts for 1 hour or until expended.

You can expend this blood boon to gain one of the following benefits:

When you make an attack roll, you roll dice: 1d6 and add it to the total.
When you hit with an attack or spell, you deal an additional dice: 2d6 necrotic damage.
When you cause a creature to make a Strength, Dexterity, or Constitution saving throw, roll a dice: d4 and reduce their save by the amount rolled. The damage you take to gain a blood boon can't be reduced in any way.