Obviously it was the arm of a humanoid monster. When the ground was gripped firmly, it dragged out its main body from the ground.
A skeleton that was wrapped in a rustic armor came out. Needless to say, it was a Skull Face. They ranged from the Jack, Queen, and to the King class. One by one they emerged from the ground until it became a huge uproar. Additionally, each of the individual monsters was two times larger than normal, as the King class was close to 8 mels tall. The number of Skull Faces filling up the plains had already almost reached that of an army.