Sorry for posting in this section I'm not new, I've been playing SK since like 2011ish around the time SK started up but I didn't know a place besides this where it's dedicated to ask questions. So I'll ask it here : What are the drop rates for fire crystals? Include depth to please.
I have a FAQ about Radiants. It links to two data sets, by the guild Lancer Knightz and the player Skepticraven, which might help you.
https://wiki.spiralknights.com/User:Jdavis/FAQs#How_do_I_find_Radiant_Fi...