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Aya casts two Inner Barriers on Lynette; that should be enough.
Guyon heals Lynette and, if possible, attacks with Starfall as much as he can (he could also use a mechanical attack, but he's not in range, so...).
Ahuli regenerates and attacks with everything he has from his position.
Suyen should move closer; it doesn't matter where. If he's in range, he should immediately use Lunar Dance, with fire disabled.
Klin attacks and attacks again.
Bubun flies in an arc to reach the target (somewhere to the right and below). If he reaches, he immediately attacks.