Quote Originally Posted by IvanLedah21 View Post
CR/SU guaranteed would be MUCH better use for a black if you're not going to use 2 copies, unless you're never going to use said unit's first copy. I honestly don't understand why people would even sell their 3% chance lucky draws unless said lucky draws are units they've already CR'd and duplicate usage is inadvisable (like Deine, god that cost says NO to using a 2nd copy), IMO the RCs are a means for whales to use their spare gold and less useful platinum units for something other than mini-plat armors, not something you'd throw an ultra-rare unit away in favor of PART of the cost of another unit that you're guaranteed to get if you play (or whale) long enough.
I prefer to have only one of each unit, I don't use duplicates as I feel like making each unit special and having duplicates takes that special feeling out of each unit. I am yet to get a double black yet so now sure if I will discharge or add to my existing one. Only black I have currently I don't use is Berna, I have plenty of other rouges to take her place and haven't needed a black rouge's power to deal with any missions yet, so if I did get a double of her I would most likely sell it no hesitation, though if it was one I do use like Sybilla.....I might consider CRing.

Quote Originally Posted by Unregistered View Post
these rainbow cristal will stay around or only for limited time?
I believe these are a permanent addition like Demon Crystals, it is just a new way to shop that benefits pay too play players more, free player can still use it they just wont get the Rainbow Crystals as fast as those discharging their doubles they get from their runs at the summoning shops.