Satan Steps In!

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As Insecta kept expanding her entire hive body everywhere, composed of countless monsters fused together into a giant, sentient swarm, the true body of Stan started breaching through the Demonic Gates he had opened himself. It seemed that somehow, my ability to wipe out over half his army with ease were not being ignored, and he seemed genuinely and royally pissed.

"KIREINAAAA!"

With a furious roar, the voice of Satan reverberated across the entire battlefield within the depths of Hell's Greed Layer. Satan's Layer was right above the Greed Layer, so it was very easy for him to breach through the Dimensional Boundaries and dig his way down here.

The cracks he makes into the Dimensional Boundaries end up becoming the Demonic Gates, gates between dimensions that connect to different types of Hell. The Demonic Towers are Demonic Gates in a way, being able to connect to all Layers of Hell and summon Demons from them.