You can incorporate items from their corpse such as ripping off the diamond from the leggings, taking the tips off the weapons, taking jewels off the various trinkets. Would not think the banner needs the equipment as a whole and destroying the weapons to incorporate into banner as see fit works as well and would still show dominance. You can also now just use corpse as well, but not as powerful. The game mechanics now just encourage being a jerk if you want a more powerful banner. Like I said most of the other skills went to broken instead of destroyed, figure this one should.