Not taking Gau? He is the most broken character in the game if trained correctly. Honestly if you are level 55 with all going you can take what ever and mop the floor. On Terra though put the Gem box and Ecodimizer on her. The fixed dice for Setzer with a Ganji glove and the offering to roll the dice 4 times an attack. Keep the Blizzard orb off Umaro and you will walk through the place.