I am updating my previous notice with new information and to clarify my previous message. The lilies can be found in Frey's Breath. At least ten of them are needed to synthesize a cure from Tanau, the source of the illness. This can be done at a research station located behind a waterfall in the Climb.
If anyone has a lily or thoughts about how to appeal to Tanau, please let me know.
-Loren, Grand Healer