Blood Bond

You take blood from a willing creature or willing creatures (Up to 4.) Those creatures maximum hit points are reduced by 20. This cannot be reduced by any means. This wears off after a long rest.

Upon completion of the casting of this spell, each creature receives 20 temporary hit points.
For the next 8 hours, you receive the following benefits as long as you are within 30 feet of another creature under the effects of the same blood bond;

• Each creature gains bonus Necrotic damage equal to the caster's spellcasting modifier on all weapon damage rolls the creatures make.
• Each creature gains resistance to Necrotic damage.
• Each creature may use an action to roll up to 2 of their hit die, and heal another creature under the effects of the same blood bond for the amount rolled. This action may be performed once per creature under the effects of the bond.