The corrupted nature spirit lets loose a burst of positive energy, healing the two front liner combatants and all other living creatures within thirty feet of her, starting to wash away wounds for her comrades in melee range of the metal beast. She then moves to follow it, hoping to confuse whatever passes for it's mind. She adds "If you need something stronger, just let me know."

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Standard, now that I'm close enough to pull it off: Channel Energy, healing the living, courtesy of the Life spirit. Every living creature in range (30 ft) who wants it gets: (7d6)[25] positive energy healing.
I don't imagine anyone cares to resist, but if you want for some strange reason, it's Will DC 31 half.