Unbreakable Pact

Two willing creatures decide to make a mutual promise to each other, a pact. both must both slit their palms with an obsidian shard, take a pomegranate seed and place it between your palms in a sort of hand shake and create a rite. The person to propose the unbreakable bond is the one to slit their wrist first. If any one person, during the ritual casting, decides to break away from the deal, both parties take psychic/force damage equal to 20 minus their Wisdom modifier; by the force of the incomplete spell's dissolution. 

Should the deal be completed, this mutual promise will impact the everyday lives of these creatures. If one of the creatures attempts to break this promise, they must make a Wisdom Saving Throw. Upon a failed save, each creature takes 30d8 Psychic Damage. The damage is halved upon a successful safe. Should one or both of the creatures be conscious after the spell breaks, each is aware of the other's location and activities. 

Nothing short of a Wish can break this spell. 

When cast at 9th Level, this spell creates a subconscious revulsion, or compulsion to steer away from, most things that could potentially break the pact. To go against these compulsions costs each creature 6d8 Psychic Damage.