ruby weapon is easy. just kill two members of your party and equip the either with life a(preferably life2) and all materia. equip one of your party with w-summon, KOTR and Hades and equip mime on as mant people as you can. when you go and fight ruby he will first call those tentecle things. just revive your dead and cast hades and KOTR and get the others to use mime. just keep using mime and he will eventually die.