By regaining the cut-off hand that grabbed Merus's neck and attaching it to his severed wrist, Moro transformed into Perfected Ultra Instinct state as surge of tremendous Angel Merus Divine energy enveloped his body. his brown fur turned white, and his facial stripes become lighter in color. In this state he also possesses heavier musculature than before, His body reacts automatically during combat and can increase his defenses instinctively.
https://dragonball.fandom.com/wiki/Moro