How weapons and guns that transmute work?

[Exarch_Alpha]

Got quite a few of those already, what is their mechanics?

[Arifufu]

later u will unlock "itemize persona" or electric chair mechanic in velvet room, u need progress your story to unlock this mechanic. Please don't sell black rock / black kotagana / model gun / black robe as they needed to itemize persona.

[Lynfinity]

They're materials for Electric Chair executions, allowing you to transmutate Personas into Skill Cards, unique weapons, armor and attachments.

- "Black Kogatama" is for melee weapons.
- "Model Gun" is for guns.
- "Black Robe" is for armor.
- "Black Rock" is for attachments.
- "Blank Card" is for Skill Cards.

Any Persona can be transmutated into one of those, and only one. Some Personas grant you Skill Cards, others grant you unique weapons, and so on.

Transmutating during Fusion Alarm also makes the end result better. Weapons are more powerful, Skill Cards are upgraded to the higher tier, etc.