Please don't take this the wrong way, but, I would almost be disappointed in a sylvan mage who didn't take that type of advantage as long as they did not do it anywhere inside of the village. I have yet to hear of any of our mages state, "What a nice villager, let me walk right on by without doing anything." The ally aspect of the sylvan/ragers is more because of two common enemies. Without going into too much ic detail, battles outside of cabals are going to happen between us. And we all know that taking advantage of weaknesses when available is sound tactics. The fact that Kriack was a duergar is a bonus. There have been many times when the roles have been reversed when fighting warlocks. I can't tell you how many times we have taken the grimoire only to send the head back to the village.