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Actually, I recently found out that Wisdom is offered on levels 6, 12, and 18. I've played Heroes a lot against the computer, but I didn't pay attention to this. In my opinion, level 12 is usually the best choice for Wisdom, especially if the hero is a Knight. Why take it on level 6 when you can get Logistics, Tactics, or Earth Magic instead? At that point, you probably haven't even built a second-level Mage Guild, let alone a fourth or fifth. Other skills are much more useful at that time. However, on level 12, the hero is already capable of reaching the treasure chamber of the Pandorians, where they might find high-level spells, so it's definitely worth taking then. Of course, there are some circumstances where you need to take it on level 6, and in other cases, you can postpone it until level 18. I was even once offered the chance to learn it on level 3. I wonder if it's possible to be offered it again after level 18?
