Bladesong is a weaponsmithing simulator set in the enclave of Eren Keep, the last bastion of civilization in a world plunged into despair and madness. The city is ruled by the Masked King, whose authority is maintained with an iron grip. The protagonist is a blacksmith who forges steel into deadly works of art for warriors, nobles, and mercenaries. Their primary activity involves fulfilling orders that require not only skill but also an understanding of the physical properties of metal. The blade-making process offers deep customization thanks to a modular assembly system and the ability to freely shape the blade. A variety of materials, including wood, leather, obsidian, and ivory, allow for the creation of unique weapons.