• TakafumiNaito On 2017-07-21 13:55:46
• It would be best for you to redeem all medium refines instead of ninjas.
  Then wait for refine event, preferably the new one giving you rewards for amount of refines used. If you manage to get 500 refines before using them you will also get a red chakra rune.
  Though if you go for 500 I guess it would be best to wait both refine events to be on.
  Plenty of waiting - yes, but it definetely is the most efficient way to use them.