Now I've seen it all the Great Holy weapon that can only be used by the Heroes, is a fishing rod. Also I bet the reason their stuff is bugging out and no exp is being gained is because if two or more heroes are in a party or working closely, they get exponentially less xp, and their weapons wont work as well.
Wait let me do my math they if I remembered the 4 other heroes went to another world then the should hero went in then saw another hero and says one of the 4 heroes am I doing my math wrong or are they in another another world.