Rescuing the soldiers

Mo observed that every human on the wall could project elemental energy out of their bodies in the form of elemental abilities. This meant that every single human on the wall was in the evolved realm. He was only a tier 4 mutant beast and was also an abnormality because he gained intelligence before he was even in the evolved realm.

As an intelligent beast, he knew that he did not stand a chance against any single human defending the wall and that was why he wanted to sneak past the defenders and sneak into the city, where he could hide out somewhere and observe the tide of battle. He would let the other beasts perform their role as cannon fodder and when the humans were weakened by the constant fighting, he would sneak back into the fight and perform some meritorious deeds that might give him a chance at keeping his life.