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Mayoido Antiques is a store in the Persona series. In the English version of Persona 3, it was originally known as Shinshoudo Antiques. As of Persona 3 Reload, the English name has been updated to use another reading, renaming the store Mayoido Antiques.
In Persona 3 FES, the protagonist gains the ability to create new weapons by fusing a Persona with a Nihil item. This produces a generic weapon based on the Persona's stats, its Arcana type, and what kind of Nihil item was used. When using certain high level Personas, it will always fuse into a unique weapon. For example, Metatron always turns into Metatronius.
The weapon fusion system from Persona 3 FES returns for Persona 3 Portable. New weapons have been added for the female protagonist and a Nihil Rapier has been added for Mitsuru. Additionally, Fusion Spells have been turned into items which can be purchased from Shinshoudo using gemstones.
In Persona 3 Reload, the Nihil items return, and there are new Nihil items—the Nihil Cloth and Nihil Ore—that can be used for fusion. Additionally, there are new Black weapons that can be fused into unique weapons which requires gemstones.
Created from the Black Sword
Weapon
Attack
Accuracy
Description
Effect
Required
Nikkari Aoe
145
92
Can decimate ancient demons. A large wakizashi exclusively for Makoto.
Persona 3 FES 
Japanese