The battle arena really isnt that difficult as it seems, I think it will probably take you about 8-9 fights to get the Omnislash, I suggest going into the arena with no less than 120 gp, that way if you get thrashed a few times it wont matter that much, stock alot of remedies and make sure Cloud is about to go into his limit break, this helps if you are at the final boss and you are majorly handicapped, and the best way to level up your character and your magic is to go fight the monsters by mideel, they give out huge amounts of AP and EXP.

BTW I think your brother is a visual learner, so one good bloody nose should end all your problems long enough for you to finish this game, he see's the blood he understands the consequences of his actions, its like the whole dog Pavlov thingy affect, he thinks about ruining your game, he also thinks about DNA flowing out of his nostrils. ALL is fair in love and war.:shoot: