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Promote or wait?
So I rolled a 4* -atk +def Roy and a 4* -atk +hp Seliph and the only good red unit that I have is Eirika but just as a buffer, so I wanted to know if it is worth it to promote Roy or Seliph? Or maybe wait to see if Zephiel is better or just wait for Xander?
Thanks in advance!!

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