The Northern West Mountains are considerably more dangerous than the nearby High Desert, having an abundance of predators in the area. In addition, there are no water veins in the Northern West Mountains. However, the Northern West Mountains are also the most reliable source for Crystal, Sulfur, Raw Salt, and Metal. One must take care while harvesting rocks, however, as any number of them can be Rock Elementals in disguise. On the northern and southern edges of the Northern West Mountains, two of the Oases can be found, with the Blue and Red Obelisks above them, respectively. The Grave of the Tyrants is found on the northern side of the Northern West Mountains.
To the east is the High Desert, from which the Northern West Mountains can be more easily accessed. Traveling down the western slope is more difficult without a flyer, as there are few easy roads to take. Along the central portion of the western edge is World Scar, where Wyverns live. Some can be found flying along the western slopes, making this portion of the Northern West Mountains particularly dangerous. Beyond the World Scar, and on the remaining edges of the Northern West Mountains, are the Dunes.
While astonishingly rare, Wyverns can indeed spawn anywhere throughout the Northern West Mountains, though due to its rarity, most people will assume it wandered from the World Scar.
Rock Elementals spawn in high numbers here, and in some cases are completely invisible until you get too close, use caution when transversing, or be prepared to run at a moments notice!
Despite the fact that this is the most common place for a Phoenix to spawn, its recommend to look elsewhere, as the dangers of this reigon and the massive differences in visibilty throughout the area make it a task that sounded much simpler on paper.
In Rockwell Explorer Note #13, a visual of the entire map and his route to the green obelisk is shown. Where his route started in this location is most likely Prophet's rest, a settlement that is located near the blue obelisk. In lore, he stole the settlement's artifacts and headed to the green obelisk and the settlement assumed he went to the blue obelisk, outwitting them to cover his tracks.