"Therefore, compared with the former method where the requirement of Ash Source quadrupled with each advancement in rank, Zhang Yanhang found the latter method—where the advancement only required a simple increase of three points in Ash Source—to be more reliable.
If it were the latter case, advancing to the fourth tier would only require the clearing of three areas. His current advancement to the third tier, including the Demonized Swamp, just happened to involve the clearing of three areas, so clearing three areas was something he could accept.
Although he hadn't even started advancing to the third tier yet, Zhang Yanhang was already worrying about advancing to the fourth tier. After all, if it was as per the former method, that would truly be terrifying and require early planning.
