April 2024 Update: Swordmaster, Arena & 3rd Challenge Conq

Yeah, the second guy is definitely the hardest of the three in my opinion. I don't think we can lower his morale to zero reliably if at all (and I tried, I brought Amago Katsuhisa and Shimotsuma Rairen for their actives in a test) especially because of his Stable Morale buff that prevents him from losing morale from normal attacks. I think instead you have to bring troops and generals who can tank the damage and run back and forth to achieve victory, since if your units are not next to him they can't be damaged by him. When beginning the initial attack space your units each one hex apart (allow at most three guys to attack him) so his active can only harm one of your six units. When he spawns his ninja support, get everyone you can away from him since they won't deal any meaningful damage. Getting past him is more of a test of endurance than anything else.

I don't think the three common units of infantry have enough health to make it through. You may need to purchase elite samurai or sword master to get through this one, although it's probably good to buy sword master anyway because it's a good unit.