I'll admit it doesn't make CRAZY money but if you wanna check it out go ahead. I looked hard so I don't think this is a repost. Go to 60,23 in EPL. There are Scourge Siege engineers or something like that. They give rep with Argent Dawn, they're weak, drop alot of runecloth, and drop crazy amounts of Essence of Undeath. In about 10 kills i had 4. I havn't done a long % test but they drop it alot. This is old ( been using it since pre-BC ) but i don't think many people know about it, least not on my server. Hope this helps some people!