You create a blood bond between yourself and a willing creature by completing a 10 minute ritual. You and the willing creature must cut themselves and let blood drop into the same chalice which is used in the ritual. Once the ritual is complete, you are bound with the creature for 8 hours, during which time you each take half damage from all sources, and the other half of any damage you receive is delivered the creature you are bound with. If the number is uneven, you take the larger number. The spell can be ended early by performing the ritual again.
If you or the creature bound to you go unconscious from falling to 0 hit points, the other mentally knows this and also suffers a level of exhaustion. For each hour they remain unconscious, another level of exhaustion is added to the other.
If either bound creature dies, the other is stunned for one turn, and suffers 3 levels of exhaustion, along with another level of exhaustion every hour.
As a reaction to you or the bound creature being attacked (if you can see them), you can cast this spell again as an action to cause all damage to be redirected to either you or the bound creature instead of splitting it halfway evenly until the start of your next turn.
* - (a chalice worth at least 25gp)
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