Adam's Semblance is possibly called Moonslice based on notes given by Monty. It is described as being akin to Yang's Semblance, however the main difference is that Yang uses the added power to her own strength, while Adam seems to put it all into one blow. It was powerful enough to deplete the remainder of Yang's Aura and sever her arm in a single strike in "Heroes and Monsters."

His Semblance appears to involve absorbing an attack with his sword, Wilt, and then cutting his opponent with countered force. In the "Black" Trailer, Adam uses Moonslice on the Spider Droid after absorbing a large energy beam, disintegrating the robot. It is shown in "Heroes and Monsters" that there can be a period of time between absorbing attacks and cutting an opponent, such as when his sword absorbed Gambol Shroud's bullets, and executing Moonslice after Yang appeared. In these instances when he absorbed attacks, everything red on him - such as his hair, his shirt, Wilt's blade and the markings on his mask and coat - began to glow.