To be even more specific about the attribute misunderstanding. The information that wisdom gives holy/unholy magic damage and int gives fire/lightning/cold magic damage is wrong.
First of all attributes affect different classes differently. In this case, necros gain bonus magic damage (to all types) from int, while tos for example gain magic damage from wisdom. As a general rule of the thumb mages gain magic damage from int, while priests gain magic damage from wisdom (this is true for BS also).
The only class that could be confusing where they get their magic damage from would be DT and they get it from wisdom.