I worked up this power for my Red Court Vampire.
Gifted With Soul [+1]
Description: You are different from other Red Court Vampires. Normally your kind do not have a soul, for it is antithesis to your being, and destroyed once you have had your first killing feed. You however have somehow managed to store your soul in an item, making a phylactery of sorts.
Musts: You must be a red court vampire, must have an aspect that reflects this power.
Effects:
Silence the Beast. You loose your Echoes of the Beast power. As a Red Court Vampire with a Soul your beast is suppressed by the morals other Red Court Vampires lack. You are reimbursed for the refresh cost of Echoes of the beast, since you no longer have it.
Refresh Bonus. You have somehow maintained your soul, keeping free will. Add +1 to your refresh level.
Phylactery. Your soul is stored in an item that you must keep on your person at all times. If it leaves your person, you loose the above benefits, becoming an NPC. You may spend one fate point to give you one days time to retrieve the item.
Altered Catch. You are no longer burnt to a cinder in sunlight, but you are weakened in it. In sunlight your catch is automatically satisfied for any attack. In addition add a new condition to your catch: "Phylactery Damage."
Made Whole [-1]. If you take this upgrade your soul no longer resides in your phylactery, which becomes a mundane item, it has been restored to your body. You loose the "Phylactery" portion of this ability, and the "Phylactery Damage" condition on your catch.
The idea was that her lover died and used his death curse to bless her with a way to keep her soul. It was a cool character.