just a few gear suggestions
Orbs:
Legendary Concentrated Chaos (+5 quality Int, +5 ins. Enchant, +5 ins. Necro) - DC casting
Legendary Stygian Wrath (107 ins. Nullification, 18% ins. Negative Spell Lore) - Damage
Trinkets:
Legendary Deep Promise Onyx (+5 Quality Int, +81 false life, ins./qual. Negative HealAmp)
Cloaks:
Legendary Gossamer Weave (Enchant/Illusion Focus +9, Spell Pen +9)