I think that in addition of adding fire, ice, divine, poison,or shadow damage for upgraded weapons, some magic weapons should have elemental damage type instead of a physical damage type. That way fighters and rangers would have options other than having to use wizard spells to take on some MOBs.

I haven't met any mobs that were impervious to physical damage, so I'm not really sure what you're talking about. But various mobs and bosses are all but immune to certain types of elemental damage, so this seems more like a nerf to me.

Agreed, if you happen to be weilding a weapon that adds a small bit of some elemental damage against a boss that is immune to that particular type then you would only be out a small fraction of your DPS.

If you happened to have a weapon that deals only elemental damage against a boss immune to that particular type you would need to have a secondary in your inventory and fumble to get it equipped, or would need to backtrack and farm yourself something suitable that would deal damage.

Im not sure if certain elemental types deal bonus damage to certain bosses, a mage player might have that info. If this does work, its probably such a minor bonus anyway that worrying about your weapon dealing some form of pure elemental damage is likely more trouble than it would be worth.

Looking at the boss guide over in another sections of the forum, some bosses have no resistance to certain elemental attacks.

How about another suggestion? Maybe a skill to add elemental damage to a weapon like poison shot does.

Now that would be fun. Rangers and Mages get all the best graphics. Fighter skills just kill stuff better.