The throwing power scroll is a cap increase meant to bring 120 for your throwing skills. 120 power scrolls are the highest level scroll you can get. Ultima Online's throwing power scrolls are the newest ranged combat skill added to the game and unfortunately only available to gargoyles. But throwing is great for still being able to hit monsters while they are far away and not have to run out of arrows, unlike archery because the weapon you throw always comes back to you.
Allow your character to gain skill beyond 100 all the way to 120 Throwing. Become the king of blade hurling. Ready to take out an unsuspecting enemy?