Warlocks should have bonds that are on each arm.
I realize this is strictly cosmetic but having one on each arm would bring its appearance up to the level the other class items are at. Having floating holographic items on each arm would look more aesthetically pleasing.
It also fits with warlocks having space magic... highly doubt they only have magic in one arm.
If you're a hater than you main hunter or titan and just be jelly.
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James Bond?