As an update to a previous post on Crusader Enchant, here is a pic from 35 minutes farming (three "circuits") in Tyr's hand. If you have tried this area, then you know the Archmages are the only mobs that carry the chant, and they are easily picked out by the faint green glow from their staff, so if you just want to farm them, go right ahead. I recommend a full clear, as the respawns are random, so you have a better chance proccing more Archmages that way.
This afternoon, I will be farming this area once again, I am hoping to get a "rare" Halloween bag. Blizz states that they are dropping off 51-60 mobs, and a higher droprate for elites, which this area is full of (actually, they are only elite here). Holler in comments if you happen to get a drop here. Keep smiling!