LogFAQs > #914478067

Actually, you have the antique shop by now, right? It should have talked about Weapon Fusion, right?

I would have considered this a bit too in the weeds to dump on you without prompting but it might help you out in the future.

Basically you take a Void Weapon (possible drop from Gold Shadows) and sacrifice a Persona to it to change it into a usable weapon. The higher level the Persona the better the stats on the weapon. But the important thing here is the Persona's Arcana determines what special effect the weapon gets.

Each Arcana has its own effect but instead of listing them all, I'll stick to the ones I think are most useful for you atm:

Empress Persona: Grants the Weapon Resist Wind
Tower Persona: Grants the Weapon Resist Elec
Star: Grants the Weapon Resist Ice
Sun: Grants the Weapon Resist Fire

Unfortunately, you won't start seeing these Arcana until your level is in the 30s, but once you do you can start knocking out weaknesses of your party members.

Hypothetically, once you reach Level 33 you could fuse Leanan Sidhe, an Empress Persona. If you had a Void Weapon for Junpei, you could fuse it with Leanan Sidhe and you'd get a weapon with Resist Wind on it. If you equip it to Junpei all of a sudden he resists wind instead of it being a weakness for him. Same idea with the other elements.

Certain Persona give you unique weapons that don't follow those rules and are usually really good but it's mostly the endgame-tier Persona.

And I guess in a pinch, Legion (Level 22 Fool Persona) will give you a weapon with a HP +100 effect but personally I wouldn't waste a Void Weapon on that.
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xp1337: Don't you wish there was a spell-checker that told you when you a word out?