The Destiny mythos would need to introduce a fourth energy type first...
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No each subclass has one of each element so it would not matter just have 3 subclasses for it
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Destiny 2 will likely be next-gen only and will have fireteams of 4-8 (patrol/mission-raid). Likely 4 classes with 4 subclasses. And a 4th element. Too bad none of the current elements have true status effects besides Solar's Burning or Void's Suppression.
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Arc should make you flinch.
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Colour I could see is green...red and yellow are too close to Solar, Darker Blue is too close to Arc. Yellow? Not so sure. (i.e.: Enemy with Shield, Super Colour, etc.) Call it Etheric or Soul, Aether or something else...etc.
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I see it as a bit of a triangle because of how the exotic swords work against against the same/alternate 'elements'. Kinetic is one damage type that could be fleshed out, but I believe it would be seriously week against shielded PvE enemies. Solar, Arc, Void... How about: Toxin? Precedent being the damage from Thorn and the damage from Khepri's Sting. Just an idea...
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It could be kinetic
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I've had that idea, and I even like it. It would have some serious PvE issues against shielded enemies, though