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Your link with your companion creature allows you to share with it any healing magic that's cast upon you.
Prerequisite: Ability to acquire an animal companion, an eidolon, a familiar, or a special mount.
Benefit: When you and your companion creature have this feat, your companion creature is adjacent to you or sharing your square, and you receive the benefit of a healing spell (whether from yourself or another source), you can divide the hit points healed evenly between yourself and your companion creature.