You get the last GF, Eden from Ultima Weapon, so therefore no matter how hard it is to beat him, you MUST beat him but remember to Draw the GF from him. But Ultima Weapon is nothing compared to Omega Weapon... you can fight him before the last boss and i tell ya, you are really a good RPG gamer if you beat Omega Weapon... i died in 2 shots(2 years ago and i dont play the game anymore) it sucks cuz u cant absorb his magics and it does massive dmg and he gets like 5 chances to attack before u even attack once... sheesh. But he is possible to be beaten and itll be some experience when someone actually does beat him... itll be fun too

and Three Stars' description would be GF learns Expendx3 ability and if u use the ability called Time Mag-RF in tutorial section, you can get 100 Triple(magic) from it.