Is guess that if there was a third subclass it would be for the third type of damage. Void for the hunter, arc for the warlock, and solar for the Titan. It only makes sense, each of the classes are missing a damage type.
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Tis' all to come, eventually... I still want lightning
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Titan Fire Charge, or Phoenix.
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Warlock Arc Overload!
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Arc chain lightning! Give me a chain lightning melee!
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But they need names. Got Trapkeeper for Hunter. Warlock Chaos Titan Going Nuclear or maybe Atomic, or Destruction, or Demolition. Destruction is to plain.
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Yeah it would appear so. Void Traps! Arc Confusion! Flaming AoE.