Greg's character usage relies on hot chicks and pretty armor to make his characters kinky. Even back in 1.10 and 1.11, every character he had was either a sorc, zon or assassin. I recall him ever making just 2 necromancers.
Its not surprising he failed to kill you. Especially when your necro had devastating damage potential and its weighed down by Power Surge. Also, Magic Vacuum would have ruined his Rylai to a point where he is doing nothing to you.
Right now I have a sorc (Hichiko-sama - Hi meaning fire or ice, ichiko is sorceress (miko also means it, but ichiko is more generic)) and an assassin I am putting on hidais. My next character is an elemental druid named after my friend's anime character he thought up (Kagegetsu).