This is a Sword Momentum Map made from the skin of an unknown Fierce Beast. It depicts a mighty Horse-cutting Long Saber but is incomplete; Su Mu guesses it's barely fifty percent complete.
The Sword Momentum Map is a type of Martial Arts True Intent Map.
The creator needs to have mastered an extremely high level of Sword Momentum, said to be at least the Great Success level to finish preserving a Sword Momentum Map.
At the same time, creating the map itself significantly depletes one's Sword Momentum, so even those who have reached Great Success in Sword Momentum wouldn't easily choose to make one.
Moreover, Sword Momentum is the key to becoming a Martial Arts Grandmaster. The map can allow martial artists who haven't grasped Sword Momentum to directly feel its presence, increasing their chances of initiation into Sword Momentum.
