NieR:Automata BECOME AS GODS Edition

The highest level for any given weapon is level 4. There is a blacksmith in the Resistance Camp, but he is only capable of upgrading to level 3. In order to level weapons to the final level, you will need to reach the Forest Castle on any route. Located underneath a bridge near the Royal Chamber save point is Muramasa, who can finish upgrading your weapons and unlock this achievement. The vast majority of materials needed to upgrade weapons can be found at Emil’s shop, or the vendors in the Resistance Camp and Amusement Park. If you need beast hides, those need to be farmed of animals in the City Ruins. Only one weapon is needed for this achievement, however if you want to earn Inorganic Blade (30G), you will need to locate and upgrade all 39 weapons in the game. This achievement can also be purchased from the Achievement Shop for 50,000 G after completing the game.