After passing through the gate, the old man and his disciple seemed to be transported to another world. Unlike what one might expect from the inside of a cave, the scenery in front of them was a massive underground city. No, it might not even be truly underground and is only made to look that way.
Unorthodox Cultivators aren't the most trustworthy people, after all, and having one's base underground could come at a huge disadvantage, especially if some of the stronger people on the continent decided to get involved.
That being the case, only a select few in the Crimson Slayer Sect know the true location of this city.
Besides that, the city is very much real and functions similarly to how any other Sect would. The only major difference is that the disciples have a bit more freedom to do what they want within the Sect than in Orthodox Sects.
