I think it would be very nice if we had to collect x thousand y item from a certain humanoid in order to make a traditional equipment special for that humanoid. Collect 2000 troll bone necklace to be able to learn making traditional troll shield for example. Or kill 4000 trolls as archievement to learn making the traditional troll shield. They would give you bonus against everything except players or each equipment against different groups of few creatures, but never against players.