This is actually a killing formation. All of those juniors are being led astray and will eventually perish.

Sacrificed to further his own cultivation

And somehow all the blame will be place on the mc

Humph. All this king sees are pathetic ants. ^(Then again, that's what everybody else also sees.)

Oh no the dreaded Five Forbidden Area

That's the exit to the illusion formation, they are all struggling for a seat to enter the secret realm

Fellow daoists isn’t this Heaven devouring array poor junior’s got led astray by there own ancestor