Again, to 's certain point, bombs. But the whole idea of this is flawed...I've blown up my house enough times to know that bombs drop walls, though they don't blow up naturals walls if you don't hit the edge of them in the explosion. But personally I'm more concerned about the fact that the only non-RNG pickaxe that isn't crafted, is the Picksaw.
I recommend you change it to only rng and world based weapons. Tools can be crafted, but not used as weapons.