Zane ultimately decided to trust Serena's advice and followed the path south of Phoenix. It appeared to have paid off, as even after several hours of travelling to in that direction. Zane was not pursued by any other Horde Kings.
As a result, he soon found himself wandering into the borders of what had once been the city of Tucson. Tucson, Arizona, was roughly twice the size in terms of population to that of the Reno/Sparks metropolitan area.
Prior to the outbreak of the war it had roughly one million people living within it. Which meant the Horde King in charge of the area was likely Tier IV. Albeit at the bottom of the scale. From what Zane had seen so far, the Tiers of Horde Kings varied wildly.