First mentioned in chapter 1410.
If players entered the map, their combat power would be reduced to less than 10%. As luck would have it, the Bosses located at the inner and core areas of the Dragon's Graveyard had quite a significant chance of dropping the Stable Design and all sorts of Advanced Designs and Recipes.
However, this was still just the tip of the iceberg. If one managed to get the First Kill on the Dragon's Graveyard's Final Boss, they would be awarded their choice of weapon at Black Dragon City. Moreover, this weapon would be a Fragmented Legendary Weapon.