You can get gunsword and kill warden. Unfortunately you can't shoot with it. You can also get iron and netherite by using again, cobblestone.
To get iron armor, place cobblestone in order, like you are crafting armor. To get netherite armor, simply just put your iron armor next to cobblestone. For rest of recipes chek images tab.
I got idea, while playing minecraft, and i thought "cobblestone os useless". Now you can get netherite without going to nether. you don't even need gold