Blood Bound

This spell was created to strenghten the union of a squad of warriors of the Order of the Iron Dragon. This spell can be cast in two ways. The first and more commom demands that a ritual must be made, prior to the combat casting of the spell. The cleric must make an ritual with all the companions he wants to create the blood bond with. The maximum number of targets  is equal to the level of the priest. He then makes an ritual at the first light of dawn, where he chant ancients prayers and all the participants make a vow of loyalty to each other. All the participants must make a small cut in their hands, and make a circle holding hands.  After the ritual is done, its power remains dormant for a number of day equal to the level of the priest, when the vows must be renewed.

After that, at any time the casting priest can use his reaction to activate the spell. The cleric can then choose any two members of the squad to share any damage they have taken, each taking half of the total any one of them have taken. The spell doesnt affect magical effects or conditions, only hit points. A target can have only one blood bond active at a time, both ritual and the spell effect. 

The other method permits the priest to share its blood bond with another target, without the need of a ritual and vow. It will affect only the priest and the target. It can even be done with an unwilling target, but it gets a saving throw to negate.