2. Ice Ball Catcher Wall
You need a wall that can take a hit. I built mine two blocks thick — packed ice bricks outside, stone bricks inside — with a snow brick parapet on top. Ice balls shatter against it instead of smashing through your windows, and the double layer means a Frostbite can’t just punch a hole and walk in. Add crenellations so you can shoot back without exposing your whole body. It sounds overbuilt for a zombie. It’s not. These zombies throw things.