The Way of the Warrior: Veteran Walkthrough - Nioh 3

Yagyu Munenori has offered to train my sword skills in the Eternal Rift. Seeing this training through will allow me to glimpse to the very essence of what it means to be a warrior—I must prove myself if I wish to attain mastery of the blade. 

Note: You must have finished The Way of the Warrior: Adept and have achieved 100000 Weapon Proficiency.

[1] Speak with Yagyu Munenori.

[2] Choose the The Way of the Warrior: Veteran Battle Scroll at a shrine/Bodhisattva statue.

[3] Defeat Yagyu Munenori.

Here are some tips in defeating them!
・Let him expend his Ki by avoiding his attacks! Then, when it's near 0, strike to get the opportunity to grapple!
・Right after grappling, hit with some strong attacks

・Samurai's Locks
・Smithing Text: Great Tengu
・Smithing Text: Swordmaster