Some of Dragon Knight's cosmetic items are missing backfaces.

The following items are missing backfaces
1. The default set: Missing backfaces on the knee caps.
2. Bitterwing Legacy set: Missing backfaces on the arm guards, the upper half of the cape, and the knee caps.
3. Blazing Oblivion set: Missing backfaces on the front of the helmet, the cloths on the shoulders, the plates on the chest and back, the upper half of the cape, the cloths on the sides of of upper legs, and on the arm guards.
4. Bones of the Slain Dragon set: Missing backfaces on the shoulder guards, the helmet, and the arm guards.
5. Dragon's Ascension set: Missing backfaces on the metal plates on the upper legs, the arm guards from both sides, on the plate of the helmet where the blue gem sits, and on the shoulder guards.
6. Enchanted Plate of the Crimson Wyvern set: Missing backfaces on the upper part of the cape.
7. Fire Dragon of Doom set: Missing backfaces on the shoulder guards, and on the fur of the helmet.
8. Fire Tribunal set: Missing backfaces on the shoulder guards, the entire cloth around the belt, body and back, and on the cape.
9. Fire-Blessed Mail of the Drake set: Missing backfaces on the helmet.
10. Knight of the Burning Scale set: Missing backfaces on the arm guards, the second layer of the cape, the armor plates on the upper legs, the helmet form front and back, the shoulder guards, and the knee caps.
11. Legacy of the Eldwurm Crest set: Missing backfaces on the shoulder guards, the arm guards, the finger guards, the plates on the helmet's sides, the metal part on top of the cape, and the shoes. There's also a gap between the cape layers.
12. Outland Ravager set: Missing backfaces on the left shoulder guard (right one is fine), the fur around the belt, the upper part of the cape, on the helmet and the hair, on the belt, and on the arm guards.
13. Pact of the Wurmblood set: Missing backfaces on the helmet, the shoulder guards, the chest and back plates, the arm guards, the leg covers, and the upper part of the cape.
14. The Blazing Superiority set: Missing backfaces on the shoulder guards, the upper part of the cape, the arm guards, and the leg plates.
15. Third Awakening set: Missing backfaces on the upper cape layer and the upper part of the lower cape layer, on the belt, the shoulder guards and cloths, and on the beard.
16. Uldorak's Hide set: Missing backfaces on the back of the helmet, and on the shoulder guards.