I beat the original campaign of Neverwinter Nights 1. It was fun playing a Fighter/Sorcerer. It worked really well. Like the guides I had read beforehand said, you are basically a fighter that uses magic to buff yourself up. Plus you have a few spells on the side for extra offense.

I found the See Invisibility spell to be really, really useful, given all the enemies who liked turning invisible. The combination of Mage Armor and Shield (both 1st level arcane magic spells), gives you a +7 bonus to armor class. So they work well together. I was using them to the end of the game. Throw in Stoneskin, which absorbs damage, and the various elemental resistance spells, and you end up a tank. A tank that can start off every fight with a fireball.