He is actually not that rare of a spawn, at least not for my group. Got him to pop back to back first 2 times then 2 PHs then him again. Just random luck I guess. Dropped the "A Twisted Elven Charm Necklace" the 3 times we killed him.
this guy is a rare spawn so when more items are posted and you something you really want, dont expect to get very easily (btw, the twisted elven charm necklace is only item posted as i type this)