Unicorn of the Abyss

A horse with a horn growing from its head. It charges headfirst towards opponents many times its size, pumping its powerful legs to launch a deadly assault. While it possesses incredible speed and intelligence, its extremely wild temperament makes it impossible to tame and ride. There is a myth that the horn on its head is the result of it having mixed blood with a monster called an "oni," but no one knows for sure.