If the player ever rolls a 10 on a die, they may roll an extra die. If that rolls a 10, they may add 2 to the total and roll yet again, continuing until a 10 is not rolled. If multiple dice are being rolled, and more than one roll a 10, then each extra 10 adds 2 to the total, and each die with a 10 is rolled to check for further bonuses.
Example: Victor, with his Swordsmanship of 8, rolls 4 dice. These result in 10, 10, 10, and 4. He has two extra 10's, so adds 4 to his result of 10, for a total of 14. Also, he rolls a three dice as a bonus, and one also results in a 10. He adds another two points to the total, for 16, and rolls again with another 10! This brings the total to an 18. His next roll is a 7, meaning he finally stops rolling, and adds 18 to his Swordsmanship Rating and his Attributes. With his Rating of 8 and his Skill Base of 7, this gives him a total of 33!