Take how I earned my Rathian Charge Blade, a frankly ludicrous combination of
sword and shield that transforms into a poison - dripping axe: I had to scavenge monster bones to build the base model, carve up several Jyuratodos (giant, furious walking fish) for a mid-tier upgrade, and then slice the tails off of several flying
Wyverns to harvest their poisonous barbs for the final version.