First mentioned in chapter 2219, when Shi Feng picked up a Blood Refining Fragment and explained it's uses to Aqua Rose.
Description[]
Secret Forging Designs are special designs that cannot be copied and the items produced would typically possess extraordinary effects such as the Mana Armor Kit.
Secret Forging Designs extracted from a Blood Refining Fragment would be items that would be useful to Level 100+ players. There is also a chance to extract an Advanced Secret Forging Designs which would be useful to Tier 5 players. This designs were created by the God of War and have special combat related effects.