Board Thread:Questions and Answers/@comment-46.208.180.156-20150616172347/@comment-112.209.82.46-20150617102242

You can clear Gradhens with just one squad if you have a mitigator :) Summon one now while the event is still up. And follow the guide on the wiki.

Lead: Lucca. Sub units: Zelnite, Zelha, Alyut/Ulkina, MITIGATOR. Friend unit: BB support or Stat booster