You tether the life force of allies together in a 20-foot-radius sphere centered on a point you choose within range. For the duration, whenever a creature in the area takes damage, the damage is divided evenly among all creatures in the sphere (rounded down). The damage division only applies to creatures that are willing and not at 0 HP.   Additionally, once per round, one creature in the sphere that drops to 0 HP can instead be reduced to 1 HP, as long as another creature in the sphere has at least 10 hit points. This feature can only trigger once per creature per casting.