Like the topic says, Titan Marks, Warlock bonds, and Cloaks are WORTHLESS!!! It would be nice if these served some purpose. For example: Blade Dancers can turn invisible. What if a cloak had a buff that extended that. What if Warlock Bonds increased stability? What if Titan Marks just increased melee attacks.
Give these items some meaning other than cosmetics.
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Legendary ones should at least provide light (if not strength, discipline, and/or intellect. But I like your idea of adding a class feature (different ones providing a different class feature).