Doomsday Pillars, Australia.
100 kilometers south of Alice Springs, stood the location of the Doomsday Pillar which was one of the three pillars visited by Alex and his team.
During the last 100 days, Alex and his entourage in particular had gone up to challenge three different Doomsday Pillars.
Starting with 10 floors on the first pillar, they then moved to 10 floors of the second and third pillars. After that, they went back to the first pillar to face its next 10 floors and so on. Fight, train, and fight all over again. That was basically all they did for 100 days in a row in this wilderness. It was no wonder that these 500 troops could reach the peak level of the Earth Realm. They had challenged 30 floors of these three pillars as well as consumed the meat of high-level mutated beasts on a daily basis.