Soldier's Broadsword is a weapon usable by Link in Hyrule Warriors: Age of Calamity.
In-game description: A sword brandished by the soldiers who protect Hyrule Castle. Its durable blade is well tuned for slaying monsters.
The base cost to enhance it by fusing another weapon to it is 50 rupees per weapon used as fusion material. This increases to [X] rupees when the weapon to be enhanced reaches X level.
Sell value varies with damage and any seals on the weapon. I'm not tracking every variation.