The Reinforced Copper Broadsword, is a stronger and heavier version of the Copper Broadsword. It is used in a recipe to make a stronger Pre-Hardmode weapon, Blade of Earth.
Because Blade Of Earth has 16 recipes (You can do with a sword of each mineral type, Copper, Iron, Silver, Gold or Tin, Lead, Tungsten, Platinum), we will only show 2 ways, but you can do with every combination
Reinforced Tin Sword
Melee weapons • 
Ranged weapons • 
Magic weapons 