OGC:Co Dependence (3.5e Feat)
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Co Dependence [Past Life, Hit Point, Role Playing]
All your incarnations have depended on a single trusted ally, and this time is no different.
Benefit: Choose another PC, NPC, familiar, or monster to be your kindred spirit. Once per session, you may exchange a number of hit points from yourself to your kindred spirit (or vice versa) up to twice your character level, so long as you have hit points remaining and so long as neither of you exceeds your maximum hit points total. You can even use this ability while unconscious or dying.
Special: Only you can decide to move hit points and how many to move. If your kindred spirit is dying, it is up to you to exchange the hit points. If the kindred spirit you are tied to ever dies, for any reason, you lose the benefit of this feat and cannot regain it under any circumstances short of your death, divine intervention, or a miracle, or wish spell.