dazed mage

When I go to the blacksmith's shop, I can't buy any arcane weapons, even when i have enough $. I notice a little flaming sword-looking icon underneath each weapon, with a number (starting at 7). Does that indicate some level of something I need in order to buy arcane weapons? If so, what is it? My mage with no points in melee skills can buy a regular iron short sword with a 7 on it, but not an arcane weapon. What am I missing????? Arghhhh!!!!!