Four days passed in the blink of an eye.
Xiao Tianyang also led the Imperial Guard from Hektonmar to the Frontline.
The Void Faction's response, however, was rather interesting.
They seemingly had no intention of employing any roundabout tactics, placing all their main forces on the Northern Ocean Glacier.
Yet, recalling the Void Faction's past combat style, their actions were not difficult to understand.
Simply put, they wanted to settle everything in a single battle and no longer wished to remain locked in a prolonged struggle with the Heavenly Martial Dynasty.
Xiao Tianyang had two guesses.
First, the Void Faction might have come thoroughly prepared this time.
Second, the Underground City Plane had not left them much time to resist.
Although the Underground City Plane's accumulated strength could not compare to that of the Elemental Continent or the God Realm, so much time had already passed.
At most, three or four days remained before the Plane Spirit of Douluo Continent could refine the Underground City Plane.
If the Void Faction did not act quickly, all their subsequent actions would only indirectly benefit the Heavenly Martial Dynasty.
It was, in essence, a snowball effect.
During the stage of entering the Elemental Continent, the Heavenly Martial Dynasty and the Void Faction had a six-to-four power ratio.
During the defense of the God Realm, their power ratio had been a Five-Five Split.
Yet by the time they reached the Underground City Plane, the Heavenly Martial Dynasty had already gained an overwhelming advantage.
Even if their raw combat strength remained evenly matched once the fighting truly began,
the various tactical advantages and boosts from fierce generals allowed the Heavenly Martial Dynasty to crush its way forward.
Part of the reason was that Underground City professionals were not skilled at fighting legions.
However, the most