Quick fix for wizards.

[Andezzar]

And once you get there, the mundanes have the same problem. If the opposition involves for example a dragon, the mundanes will have problems dealing with its mobility, its breath weapon and its spellcasting. Countering them will most likely require magic items and/or caster support and magic items must be made by casters in the first place.

The dragon is only an example. All monsters that have non-walking movement, SU/SP abilities (especially those that involve SOL) are particularly hard to deal with for mundanes.