Given the question: Build a movie plot around this: What type of magic do the Vagyu clan practice? Black magic
The answer is:
In this sixth 'Lone Wolf and Cub movie, the swordsman-for-hire Ogami Itto is confronted by a secretive branch of the Yagyu clan that practices black magic, including the ability to burrow through the earth. He encounters Kaori, a female expert with knives.And there's Hyouei, an illegitimate son of Yagyu Retsudo who kills anyone Itto and Daigoro come into contact with.It culminates in a final battle between Itto and the combined clan groups under Retsudo on a snow-capped mountain in northern Japan, in which the baby cart becomes a sled. Itto defeats the entire army, shooting, stabbing, slashing, dismembering, and beheading the entire army. But the one-eyed Retsudo again gets away, vowing to kill Itto another time