Baleful Skull

Used this item to spawn a cointech NM nammed Cannered Noz. Linkshell and I spent about 45 minutes fighting this guy. individually he wasnt very much higher level than the Cointechs in that area, but he keeps re-appearing with 100% hp after each kill. would give an alliance of 10 120+exp each kill. He casts Blizzaga3 through Blizzard5. please post any information you may have on what to do with this very strange NM