Bonded Health

Choose a number of willing creatures equal to the spell casting level of this spell that you can see. The health of these creatures becomes bonded. At the start of any bonded creatures turn add their current health totals together and divide by the spells level. All creatures health becomes becomes this new total rounded up. If the total is higher than a creatures max health they gain temporary hit points equal to the difference of the total and their max health. Any of the bonded creatures may choose to end the bond as a free action on their turn. When the bond ends all temporary hit points are lost. The caster may choose to stop concentration at any time.