“The Tournament” is a big side quest that takes place in the second half of Assassin’s Creed Shadows ’ main story. It’s very rewarding, and will get you new weapons, XP, Anomaly completions for the Animus, an achievement, and a mastery unlock for Yasuke’s Kanabo and Naoe’s Tool tree:

If you are looking for all of Genzaburo's Soldiers in Assassin's Creed Shadows, you can use this guide to find all of them and get some great loot.

Assassin's Creed Shadows does an excellent job of exploring and emphasizing the three tenets of the Creed in its story, characters, and gameplay.