[Levels] Help on "Gestalt, Decay"

I just started the chapter Body & Soul and completed Sunset's Howl, but now I am stuck on Gestalt, Decay. I have all anti-alien treasures at 100% and a Level 19 Takeda Shingen, but Takeda Shingen and Ururun Wolf keep dying in one hit. I am also using 4 meatshields, including Jiangshi Cat. Can someone help a pal out a bit? (:3 」∠)