Si Shuo had been watching from below the stage. Wei Ce's Earth Element Ability was indeed powerful. However, condensing stone required time and energy, so he couldn't form solid blocks of rock. Instead, he mixed gravel into the dirt to increase its hardness and attack power. A Beastman's best combat state was their Beast Form, which allowed them to maximize their running speed, physical toughness, agility, and bite force.
Now that he had the Stone Monster Summoning Technique, it was like a gamer summoning a Netherworld Fighter. His Combat Power would soar, and he would have a helper that would never betray him.
Wei Ce himself was an Earth Element Ability User, so summoning a stone monster in battle wouldn't seem out of place. Everyone would just assume he had condensed a special kind of stone monster from an Earth Spirit!
