Final Demise (Su)

At 10th level, once per week, when a Gray Gardener kills a creature with a melee weapon, he can draw the soul out of the dead body and imprison it in his weapon as if using a soul bind spell (caster level equal to the Gray Gardener’s character level). Destroying the weapon or dispelling this effect frees the soul. After spending 24 hours in the weapon, the captured soul escapes. However, by touching the weapon holding a captured soul to a final blade, the Gray Gardener can transfer the soul into the magical guillotine to remain trapped inside indefinitely. In addition, at 10th level, a Gray Gardener receives initiation in the secret rituals that can release a soul from a final blade (The Inner Sea World Guide 300).