What could this concept be?

If the Flying Eagles had these people, wouldn’t they have won the battle in the ancient boundary long ago?

“Haven’t you discovered that these people are all wearing the same clothes? That clearly means they are from the same sect. Someone from their sect must have discovered Nature’s Palace and informed the superiors. The entire sect gathered their forces and came to explore Nature’s Palace,” Yuno said.

Alex Rockefeller and Jade Benmore only noticed this after Yuno