So my understanding of Yin that it's not the opposite of Yang but rather corresponds with it. As Yang is Physical Energy and Sentence, Yin is Spiritual Energy and creation. Having the ability to alter and create substance in a way normally outside the realm of possibility. For example making Fire cold, or having water be solid without turning to ice. Yin is creation while Yang is life from my understanding. Like Yang, having a little bit of Yin in it. Yin also has a little bit of Yang.