[The Ozzman]

Don't forget defensive harmony, it lowers everyone is the party's AC by 2. I have went through the game twice and the biggest problem I had was trying to keep my mages alive in this battle. Try and focus on that and let your tanks beat up on the Ravager. As someone mentioned earlier, greater whirlwind attack is awesome, also dont wait until your party members are almost dead before you start downing those potions of healing.