Omega is the final boss in the holy beast shrine At first it seems impossible to kill Omega with him having 99999 hp and ep but he is rather easy to defeat with a golem that has a special attack that takes a % of damage. I used Sebastian sniper shot. The first few shots with him did about 35000+ damage. Other golems you can use is Raiko or Samurai. Lastly, keep your members out of his God Scream ability if possible.