Hektor, despite rarely being seen with it, still kept his old helmet as a memento of the... thing, he had been before the Liberation found him.
He was most perturbed when he discovered both it, and his trusty chainaxe, being paraded around the Liberator's Palace by a Slaaneshi waterfowl.
"HONK!*"
*Peace was never an option!
The Ursas of Khorne and the Anserem of Slaanesh are known to have a particularly vigorous, and cutesy, rivalry with each other; the Anserem dedicate a great deal of effort towards stealing the equipment of Ursas, and Ursas will retaliate by plucking the offending Anserem when found.
That neither breed suffers permanent damage from this, with the gear inevitably reappearing in the Ursas hands once the Anserem loses interest, and the Anserem's feathers regrowing at the same rate they are plucked, does nothing to stop either Daemon breed from perpetuating this (harmless) rivalry.