The Heraldic Order tends to field equipment and technologies with a slightly more sinister appearance than the remainder of the Ascendancy. This is rather logical really; having been isolated and indoctrinated from birth, their borderline psychotic behavior is mirrored in how they present themselves to those they do interact with; the ceremonial grandeur of their emissary's robes, the quirky nonconformity of their traders...and the darkly imposing sillouettes of the Heraldic Guards.
The armour of the Heraldic Guards is also an example of the technological differences between the "regular" Ascendancy and the Heraldic Order; the suits are bio-mimetically customized to their occupants; the six tendrils of flesh which protrude from the shells in the rib-regions of the suit are grown to produce copious amounts of the pheremones which the Heraldic use to maintain their forgettable nature in collaboration with the subatomic sensory diffusion technologies; in zero atmosphere environments, these tendrils withdraw into their tubes, much like mollusks.
Another noteworthy point on the suits are the sensory systems incorporated into the helmet, which allows the occupants to view potential events and outcomes five to ten seconds before they actually occur. This slight degree of clairvoyance makes the Heraldic Guards incredibly difficult to ambush, and leads to rumors amongst the Ascendancy that they aren't entirely human; this rumor persists especially as the Heraldic Guards are rarely seen, and never seen out of uniform.
Finally, the two spikes above the wrists are energy emitters, capable of generating both energy based projectile and bladed type weapons with a wide degree of customization, allowing the weapons to be specialized for particular scenarios. Powered by temporal bleeding, these complete the suit as a potent weapon for an already dangerous combatant.
As for their uses, Heraldic Guards are generally used for specialized missions, and are very rarely fielded with the support of non-Heraldic infantry. Common uses include escorting Heraldic emissaries and assassination missions; in particular, teams of Heraldic Guards roamed the galaxy aboard small hunter vessels in search of individual timecasters...