A onepoint wonder. Well, wonder's a big word with this skill, the life return you get from it is pathetic and it has a huge cooldown. My proposal is to let it start out with 300 health and give 100 health per skillpoint invested in it, as well as giving a 10 second 20%damage absorption, which increases by 2% per skillpoint invested in it.
Either that, or a more interesting way, like someone on tqitfanpatch proposed: Make it do some form of lifedrain attack on low health.
That's much cooler, imo, and very fitting for Spirit, but I'm not sure if this will work out all that well though. How would that work against undead, ranged attackers, bosses, etc..?