The Visit

Ranboo's white side is a mask that blocks vision from his left eye. Under the white mask is a purple eye and when that eye is granted vision that side of him takes over and his other eye turns purple. He then enters the enderwalk state. The only way to get him out of said state is to replace the mask over the eye. Then he will fall asleep for a few hours and wake up with no memory of what he did during the enderwalk state.