Lifeproof safely removed a vital portion of the target's life, even through solid objects. The removed essence was called the Shadow of the Heart and was placed within a glass container or crystal. The Shadow of the Heart appeared as a transparent image of the target's heart.
The target was able to sustain nearly any form of physical damage as long as their Shadow of the Heart remained safely within the container. The target would even function normally beyond the point of "death" when their body would normally have given up. Severe damage made the target appear as one of the undead, but the target was able to heal from this damage over time. Severed limbs functioned normally and could be reattached.
The container holding the Shadow of the Heart needed to be within sight when the spell was cast. After a successful casting, the container could be removed to any distance from the target. If the container was destroyed, the target would instantly perish.
This spell required a transparent crystal or glass container to cast. The container needed to have a diameter of at least 1 foot (0.3 m).