"Being souless doesn't mean being stupid. There is way to simulate intelligence with magic. Have you ever seen an homonculus. Many artificer have one. My father have one to help him with his trapmaking work. The creature is just as bright as the average person you meet in the street. Warforged are a summun in creation as it isn't not only a construct, but also a living creature. Constructs are animated metal (or any other non-living material), some mindless likes golem, some bright like an homonculus. Warforged are living creature, creation of life through magic. Before house Cannith, only the gods had done that, all the others before them had created magical animated statue (it's a bit more complicated than that, but that's the spirit of the thing). These iron guardians looks like dogs, and I wouldn't be suprised his creators have given the mind of a watch dog. They must think there master is the owner of the book. I cannot tell how they would have be trained, but I doubt they will be happy to see a bunch of people coming in there territory." explain Kharas.