Coliseum Bee Ess

I'll be doing coliseum, thinking I'm doing well...I have all 4 characters up, level 50's, full health, at least half protection only to be AOE 1 shotted by the coliseum foe.  It's not fun when this happens and it happens and games are supposed to be fun, not stupid ash get wrecked if you don't pay us hundreds of dollars to win. It's BS.