Ok I usually solo quite a bit in Skyfire and logged on today, and saw this thing on my track. Naturally I ensnared it and Rooted & DoT'ed it too. WHOLY CRAPOLA. This thing took no less than 15 Winged Death spells, maybe more. I sat there for like 10 minutes, and just kept recasting it. Has to have like 5 times the HP's as a WURM, at least. Says at the end that I got xp, but the bar did not move, I think that maybe why it is called a SHADOW drake...suckers you in and you get nothing, but it did drop Necro/SK spell Conjure Corpse, which (for necro) is level 57 I believe.