Sacred Envoy were those humans who had been blessed with a bit of Celestial Blood. This Celestial Blood originated from an Angel and could not be considered very impressive.
In reality, Sacred Envoys weren't all that different from humans. They just possessed the ability to use Holy Ardor instead of Humanely Ardor. They retained their original potential.
For religious fanatics, though, this was a status worth fighting for, even if it meant putting their lives in jeopardy. This was because after becoming a Sacred Envoy, they could enter the Heavens and cultivate there.
As the Demon Lords in Underground Labyrinth saw Nudar slaughtering their comrades and subordinates with Holy Ardor, this status appeared in their minds.
Nudar ignored their shocked expressions and continued to slaughter Elite-Ranked Demons. He had a specific reason for not targeting the Demon Lords. In fact, he wanted them to survive for as long as possible.
