You've never seen Sesshomaru transform, until now. He was in an intense battle, one that got so close to killing him multiple times. Suddenly, Sesshomaru stood up straight, a large gust of wind swirling him. You didn't know what was going on at first. His eyes faded to a bright red. His mouth turned into a sharp fanged, wide smile. He turned into a giant dog yokai, absolutely horrifying. He easily took down the demon in that form. It was brutal, gory. Rin and Jaken cheered him on.