If it were just a Peak Saint King, Lin Yun wouldn't worry about anything. His current strength, while not the very top in the outside worlds, could still compare with upper Saint Kings. Moreover, with the magical abilities of the Blood Prison Sword, even if faced with a Peak Saint King, a prolonged battle wouldn't necessarily determine a winner or loser.
Furthermore, there was the Peak Saint King Realm's Qingshang, who, during these days, had completely recovered his strength from some essence blood energy absorbed by the Blood Prison Sword and even made some progress. The special techniques Lin Yun had taught him would certainly allow him to handle an ordinary Peak Saint King with no problem.
What Lin Yun worried about were the other top Cultivators. In this period, he had offended quite a few Invincible Saint Kings and Peak Saint Kings. In this universe, he had no problem dealing with those Invincible Saint Kings and Peak Saint Kings.