I managed to get a couple threads tonight. None last night, though. Everyone is jumping on every dark wisp that spawns immediately; they don't last long.
I stumbled across a shadowlord waaaay on the southwest corner of Moonglow among the trees and hills. I let him chase me back towards civilzation and waited for a couple of tamer's dragons to start hitting him before I spammed armageddon on him. Yeah he was at no health in less than 10 seconds but didn't die for a good 30 seconds afterward. Odd.
I did so much damage to him, my loot included the cloak, almost 10k in gold, about 100 spell scrolls, and about 30-40 armor, weapons, and jewelry; of which a lot were amazing. The corpse decayed before I had enough time to go through it all!