You can swap some skill points from dodge and barrier to put 13 skill points into the Tempest blessing from Storm to use it as a passive damage dealer. 5/5 Discharge and 5/5 Enhanced Amplify. Epic weapon and shield are somewhat mandatory for + capacity on all spells. Copying this 1:1 might not result in the same final outcome. You need to adapt survivability and energy management according to your gear.

• 
  Hades' Helm of Darkness

  stats

  • 15/30/45% increased Cold Damage
  • 3/6/9% Magical Resistances

  completion bonus

  • 10% of Energy Reserved
  • 10% more Cold Damage, 2x against Undead

  
• 
  Necrotic Bones

  stats

  • +12/24/36 Energy

  completion bonus

  • +4 Energy Regeneration per second

  
• 
  Dionysos' Wineskin

  stats

  • 3/6/9 Health per Level
  • +5/10/15 Armor per Level

  completion bonus

  • Gain 5% of your Maximum Barrier as Barrier for every 100 Energy spent
  • Gain 20% of your Maximum Barrier as Barrier Decay Threshold
  • 50% more Barrier Decay Rate

  
• 
  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

  
• 
  Turtle Shell

  stats

  • 2/4/6 Health per Level

  completion bonus

  • 4% increased Health

  
• 
  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

  

Check video.