A concern from a newbie here:

I've just managed to pull Reiki out of the 60 divine souls goal in the raid event, but I'm running out of seeds to farm the raid. My question is... are these kinds of events recurring, and if so, what's the general cycle of raid events?

If not, is it possible to get Reiki in any way outside of this event (limit break ya know), or is she locked within the fortress raid event only?