This subclass has been given the lease attention but has the most lackluster perks/modifiers.
"War Machine" and "Gift of Light" don't get much use because they aren't as helpful or effective as keeping the shield up with unbreakable.
War Machine should emphasize shooting over defense and be quick to activate, reduced strength Force Barrier (50/60%) and trigger Force Barrier on hit should be added.
Gift of Light just needs any incentive it can get. Slap on reduced melee cooldown and call it a day.
Edit:
A good half of you don't understand what I'm saying and jump to the conclusion that I think these perks are unpowered. That is not what I'm getting at. I feel that these perks are strings but somewhat over shadowed by Force Barrier and could encourage more diversity if given more to them. If I thought War Machine was terrible would I suggest this modification.
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Defender here. Personally I love the melee how it is, is rewards you for timing your punches. I really only use war machine so I can't provide alot of input on the other two, but it's extremly useful in every situation I've ever been in. Near instant reloads on even machine guns!