For this Resident Evil Village boss fight, Heisenberg will turn into a huge mass of mold, flesh and metal.
Preparations
The vast majority of the fight will not require you to spend any ammunition. Nevertheless, upgrading the grenade launcher at some point and having explosive rounds might do you good — the out-of-vehicle part of the fight will require some heavy stuff.
Boss fight: Heisenberg
Board the tank and move forward into the elevator. Fire a cannon shot to open the gate. The fight against Heisenberg begins: aim for the red areas on his body.
When he raises barriers with his magnetic powers, try to find an opening where you can continue to shoot at him. Use the cannon as often as possible.
When you get caught in the eye of the tornado and get close to its face quickly and fire the cannon.
You will then be thrown out of the tank. Without the tank, you'll have to aim at his head with everything you can until he returns to the center of the arena and starts a new phase.
