Obtain a a dragon's tooth on a necklace then find Throwfar in the village. Use "sayto throwfar challenge" and he will ask you for gold. Give him 10,000 gold, and he will give you rabbits to throw. "Hold" and "Use" the rabbit he gives you in order to throw it. He will give you three tries - you must beat him all three times to gain the mark.
Note: You can only challenge him once every 15 real time minutes. Spamming it will be rewarded with punishments, with zotting and smiting. When he is ready for you to try again there will be an emote: Throwfar's breathing returns to normal, after getting all excited by the game of Rabbit Toss.