The thousand-kill sword was just a saying. It might not really be a thousand killing intents being injected into the sword. A little more or less didn't have a big impact on the power of the spiritual sword. However, 1000 traces of killing intent was a threshold for a weapon refiner. Only by completing 1000 traces of killing intent could one be considered to have stepped into the threshold of the weapon Dao.
The Orthodox Weapon Workshop did not have as long a history as Yunzhou 's, but it still had a history of thousands of years. The owners of the workshops had focused on smithing and neglected their cultivation. Their lifespans were not long, so they had been passed down for more than a dozen generations. However, only two or three of the past owners had been able to complete a thousand traces of killing intent and step into the path of craftsmanship.