Among the four demon monarchs in front of him, Holy Lady Strings was the most well-rounded. In a one-on-one battle, Meng Chuan would be at a disadvantage against her.
The mountain demon's body was in no way inferior to Blood Shura's. Back then, King True Martial was assisted by King Calm Sea's influence on the flow of time, allowing him to unleash the Ten Absolutes of World Annihilation—which killed Blood Shura—instantly. Although Meng Chuan had unleashed his full strength, he only had slightly greater strength than King True Martial's normal strength. His attacks were still somewhat inferior to the Ten Absolutes of World Annihilation.
As for Demon Monarch Quicksand—who could turn into black mud, giving him a virtually undying body—it was equally difficult to kill him.
Meng Chuan believed that he had the highest chance of killing Demon Monarch Mountain Splitter.