Following Green's lead, they continued to descend through various Abysses.
After bypassing many forks,
the Abyss they arrived at this time was quite special; the [entrance] was shrouded in an exceedingly dense "Unnamed Fog."
Due to the influence of the Chaos attribute, the mist would construct and solidify into various aggressive limbs, tentacles, and even independent entities to prevent anyone from approaching.
Even without the Mist's obstruction,
the entire Abyss was in a closed state, with Chaos Tentacles weaving together to form a great Abyssal mouth capable of blocking a King Level.
Green explained simply:
"This Abyss is currently known as the [Chaos Prison], and many troublesome entities are confined below... Of course, if there's a need to use them, they might occasionally be released.
Otherwise, Father wouldn't waste resources and space like this; it would be more straightforward to send them to the Abyss Party as food.