Decked her out with EM on the first try. No PC + a tendency to animate all of her CC + defense based on critters means Promise gets absolutely wrecked by Spine Carapace+healing.
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http://imageplay.net/)
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She got me as far down as 28 HP on two occasions, and at one point had a 28 ATK eternity that she kept blessing so it would survive against Spine Carapace -- never occurred to her to rewind it before it died, though.
The star of the game was the Life Nymph, who Adrenalized enemies so they would die faster and my own Vamps so I could heal up whenever Hope was low on fuel.