He certainly knew to what extent the levels of life energy and death energy had reached. Just possessing one of them allowed Ka Ao and Tian Xiang to ascend to the Seventeenth Level, while he himself, despite having Fire and Ice of the same origin, if discounting other strengths, could at best only reach the Thirteenth Level now. The gap between their levels was truly too great. Precisely because of this disparity in levels, the fusion of life energy and death energy was hundreds of times harder than Fire and Ice of the same origin. Thus, when Ka Ao and Tian Xiang said they had found a method, Nian Bing's heart was filled with doubt and curiosity.