Thread: The value of Grails and are they worth Demonic Cores

I see no reason why the cores would reset each event, when none of the other Advent shop items do. And I'm not worried about potentially losing a few R grails, the effects of which can be easily compensated for with a few thousand gems.

Where do you get demonic cores? Is there only the one from the first Ragnarok clear? (Nowhere near tackling that yet)

You get 1-2 demonic cores per Ragnarok clear, and an extra one for the first-time bonus.