I discovered that Lightning Strike damage is really good, so I tried to stack as many procs as possible. I even used summons to get even more procs, and the final result is surprisingly good. This build requires some hard-to-get gear, so make sure to farm it before switching to this build.

• 
  Poseidon's Trident

  stats

  • 15/30/45% increased Spell Damage
  • 4/8/12% Lightning Resistance
  • 30/5/10% Shocked Resistance

  completion bonus

  • Every 3s, 100% chance to apply Weakened to all enemies within 3m area
  • 9% increased Weakened Ailment Power

  
• 
  Vile Ichor

  stats

  • 3/6/9% increased Cast Speed

  completion bonus

  • 20% increased Spell Damage

  
• 
  Necrotic Bones

  stats

  • +12/24/36 Energy

  completion bonus

  • +4 Energy Regeneration per second

  
• 
  Necrotic Bones

  stats

  • +12/24/36 Energy

  completion bonus

  • +4 Energy Regeneration per second

  
• 
  Selene's Moonlight

  stats

  • 15/30/45% increased Spell Damage
  • +5/10/15% Cold Resistance

  completion bonus

  • Killing grants +3 Energy Regeneration for 4s (stacks 4x)

  
• 
  Hypnos' Calm

  stats

  • 4/8/12 Energy Regeneration per second
  • +30 Energy Reserved

  completion bonus

  • 20% increased Energy Regeneration while below 50% Energy

  
• 
  Vile Ichor

  stats

  • 3/6/9% increased Cast Speed

  completion bonus

  • 20% increased Spell Damage

  
• 
  Centaur Hoof

  stats

  • 3/6/9% increased Movement Speed

  completion bonus

  • 10% increased Movement Skill Cooldown Rate

  

What I do is hold the right mouse button to constantly spam Call Lightning while using the left mouse button to cast Cyclone every few seconds. Basically, it's a two-button spam build and by doing that you get infinite Barrier with decent mana recoup.