On Veteran/Elite survivability is essential in Synergies mod, and I strongly recommend investing points into it at every occasion.
My personal suggestion is to start building the offensive spells first, since the early minions fall behind late game, unless you buff them with passive bonuses. His/her skills mainly revolve around minion mastery, but he/she also has offensive spells along with crowd control spells. The Necromancer is a fairly versatile class.
