While Erich was slowly making his way to the extraction point, the rest of his team had covertly made their way to the Oni Royal Palace. Luckily for them, their stealth field generators were undamaged, allowing them to easily fly through the skies at low altitude and remain undetected.
The Royal Oni Palace was not easy to assault, at least not on foot. For starters, one would have to breach the walls which were built atop a crater. Then they would have to scale down the crater itself and into a lake, which the Oni Royal Palace floated atop. It was damn near impossible to achieve.
Not only that, but the palace was equipped with all kinds of aerial and orbital defenses. Allowing it to remain completely unharmed from the bombardment, and allowing them to shoot down any potential atmospheric fighters, or even jet troopers.