Max Raze (Necromastery) by level 7. Get one level of Presence of the Dark Lord at level 4. Do not level Requiem of Souls until you have Shadow Blade.
Always buy Sentry Wards and Smokes early. The shop has limited stock, and having them on cooldown ensures you have a vision advantage when the map gets dangerous.
Immobilizes targets and deals massive damage that even works against buildings , allowing mages to push towers effectively.
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Power Treads, Echo Sabre (into Bloodthorn or Harpoon), and Black King Bar. 3. "Frostbite Carry" Crystal Maiden