Sacrifice

Radiant Spell, Tier 6, 1 Action, Single Target

Reach: 4. Reduce yourself to 0 HP. You cannot have more than 0 HP until you Safe Rest. Heal a number of HP equal to your maximum HP, divided as you choose to any other creatures within Reach. You may revive a creature that has died in the past minute if you give them at least 20 HP (also healing 2 Wounds from them), provided they have not been revived with this spell before. Upcast: +4 Reach.

From Core Rules