One spell, and your wall of skelletons will die. You might try and spear him from a distance while keeping clear of his spells. I acually remember playing a Skellynecro in singleplayer (never made it past Duriel), and finnishing Andriel with nothing but Stone Golem level 1, which did all my damage, and when I didn't have mana for it anymore I walked up a level and stood there waiting until I had! <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" /> Took ages, I might add...
Übereil
