Pretty much the only time I've used it is when I'm going to be rezzed and I know the cleric is LoM. Mem it before you get the rez, cast it and soon as you zone (assuming you didn't re-ding with the rez), and leave it up while you loot your corpse and regen health for a bit. After you get a few hps you'll want to click it off and start cannibalizing.
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