The Leopard Scroll is 1%, much like any other scroll ingame.
Leopard Dungeon is a place where you can get the drop of the leopard scroll to awaken your leopard fruit.
Your spawn point
Tip: Awaken Chop is useful against this type of bosses. Awaken your Q move on Chop and you good to go. But it will take a long time if your a low level player. Good luck. you can also use a good AoE fruit like darkv2 or g5.