Hela's difficulty level is too high
There needs to be a lower limit on how much Hela can regenerate and block damage in the Gods of the Arena contest. I just fought her at the Heroic level, and I lost my entire team (including reviving one champion 3 times). The final opponent shouldn't keep getting that much stamina back - when Hela's meter comes back from nothing 5+ times, that's too much. I know it's supposed to be difficult, but that's ridiculous. It takes all the fun out of playing, and goes from challenging to extremely frustrating. I still have to play "Show of Force" three more times to reach 100% completion, but it's not worth it if it's that difficult.