The soulstone effect would have to be self-cast from an item with one charge that casts a Divine Intervention buff on the user. However, you'd have to find a way to make it fire off 100%.
Also, it wouldn't work quite like in WoW; in WoW, when it went off, you'd be 'dead' and would get to choose when you popped back up. If it works like Divine Intervention, it'll automatically heal you to full when you are about to die.
Just my thoughts on the subject.
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