to add onto this, it's said that SSR is worth 35 R and SSR grails are worth 50 R....
but given the most you'll ever need is 58 (skill lv29 to skill lv 30 when we get FLB weapons later on), you'll probably never advance the level of a SSR grail and maybe one (and only one since that's all you need) of an SSR weapon.
but the SSR grail is very rare (only seems to be that one in the shop which is a waste of a dragonic eye), and people should only feed SSR they don't want as skill fodder (like the adram SSR bows from the last event I got)
slashley more or less covered this, but also should point out that with union events, only the lilim fights pop up in the list of raid battles... demon ones are ALWAYS union member raids and they're only found in the actual event area.
also, another benefit to only having union members attack the lilim in those fights is that multiple people should get grails, speeding up the grinding process to get buffs





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