There is a bug with the Mantle of battle harmony exotic chest piece for warlocks where its not granting the temporal bonus damage as the tip says. It does give super energy on kills up until the super is full but as soon as the super is full I don't get the extra damage from the exotic, instead the Energy siphon exotic perk keeps on showing up on kills instead of giving the extra damage. This could be related to how icefall mantles the gauntlets for titan had this feature removed and so maybe the feature was wrongfully removed from this exotic too.