“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:

Shadows is Ubisoft's most successful game in the franchise by a Japanese country mile, ranking high in both sales and player counts.

After a seven years of bad Assassin’s Creed games, Shadows has finally gotten me back into the series and makes me excited for its future.