Azban's Life Debt

Using a ritual blade conjured from the lands of the dead you draw your own blood to bolster your allies. You deal 1d6 + your spellcasting ability modifier necrotic damage damage to yourself, granting an equal amount of Temporary Hit Points to each of up to two target creatures that you can see. As a bonus action you can end the spell and reclaim the vitality granted to your allies for your own benefit. Doing so will heal you for the amount equal to half of the remaining Temporary Hit Points + 1d4 dealt as necrotic damage to each of the targets. Unless cancelled by the caster the spell will remain in effect until the end of the day as long as the Temporary Hit Points granted by this spell remain in effect. During this duration the caster can not gain or restore any Hit Points.