I use eos, and keep her on steady until afterthe second repel, right before the bees come. As soon as the second repel ends and the purple comes against the back wall: Rouse->Fey Illumination *eos using her buff and regen here* and then I just try to keep succor up the whole time. Eos can really be insanely healing over kill with rouse+fey illumination, almost like having a second healer, and the wall is usually dead right as she's recasting Whispering Dawn again. Just dont forget to dodge the repels, and make use of Lustrate and eye to eye.
