Relic Fusion is process of creating the Artifact Swords. They require the player to be skilled in both Adventure & Crafting. In order to complete a Relic Fusion, the player must first collect a rare material from a fallen Enemy. Only certain Bosses will drop a relic material, and they are all rare drops.
Each relic material has a corresponding material in the workshop where it requires all 3 of the Rank-A swords for that item. Next the player must craft the item for 36 hours, which means there is still plenty of time for the player to fail this fusion if they do not maintain proper temperature control, or are unable to get enough people to hammer it.
You need a Quality of 24 to succeed in fusion for the 1st page & 36 for the 2nd page.. CP is limited to 200. However, Trophy and Mastery will count, along with the Hammer Quality. You also will receive 12,000 EXP after the completion of each relic.