Into The Labyrinth
Damage to the Heart Rune, if it does not cause immediate death, incapacitates the Patryn in a variety of ways.
First, it damages their access to their magic; the severity of the wound determines how much or little of their innate power they may use.
Second, the Heart Rune can only only partially be healed by magic. After that, it heals at the normal rate, and no amount of magic will make it heal faster.
Two Patryn may also enter in to a Heart-Rune Bond, should they so desire.