Game changing characters appearing in onetime banners is pretty much just rage fuel for the majority of even casual spenders, much less free to play. I’d rather they cycle them more regularly, never issue op units on limited, or release them as less apparent wale food. My $100 wasn’t enough to get her- aparrently I was supposed to spend $240 for the guarentee. Feel your pain homie. 

Get Doris, maybe Hazel or Rin they do ALMOST the same as Diene

No luna, just abandon hope and this game

Unfortunately probably not for a while maby a year or so, so just save for Luna and or other Up coming Limited summons