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.
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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.