[quote=McHaggis]
I don't mind if it just alleviates the symptoms for Moon Sickness for even a brief time, so long as it has some effect on it.
[/quote]

I'm not one to completely negate an effect as for how long, I suggest the flower's effects lasted much longer then his herbs requiring less treatments and still shows off the power's potential while allowing the weakness to be there later. 

 I just didn't want it cured which was my main worry. ^-^ 

Likely with Roan on the run and in addition to when he's discovered to be an Evoker, he'll likely need an alternate healing for emergencies when his herbs aren't enough to nurse him back or goes too long without them. Those herbs are harder in some areas to find outside the Empire and since those hunting will likely know he's got Moon Sickness, any merchant who carry it will be watched.