Now that Lu Yuan has formed an alliance with the Five Poisons Sect through marriage, the Miao People, who once bore a deep hatred for him, are no longer as uncontrollable as before.
It would be rather cruel to kill all of these more than 700 Miao workers for the sake of keeping secrets.
Furthermore, indiscriminate killing would only reduce his own population.
In that case, it would be better to make these people the guardians of the altar.
After all, these Miao people live in the mountains, and their families can be relocated here to establish a new mountain village near the altar.
With a Miao village nearby, the altar can be maintained, and outsiders can be prevented from destroying it, saving Lu Yuan the trouble of sending additional guards.
Given the Miao people's preference for living deep in the mountains and their reluctance to venture far, coupled with his strict orders, they could be trusted to keep the secret.
