Autonomic Basalts have a very high resistance to Physical attacks. Elemental spells should be used to do damage, with Wind spells taking priority.
In Golden, Autonomic Basalt appears in Halls 1 through 4 of the Steamy Bathhouse within the Midnight Channel. It also drops Smoky Quartz that can be exchanged at Shiroku Pub. The amount of Powered Iron needed to unlock the Bastard Sword stays the same for Golden.
Persona Q: Shadow of the Labyrinth[]
Autonomic Basalt appears in Stops 1 and 2 of the Group Date Cafe. When defeated, it may drop Rock Piece, Rock Hand, and Rock Lump. Rock Piece is used to create the Kaiken for Koromaru and Yosuke, and the Rash Guard unisex armor. Rock Hand is used to create the Tigerhide Belt male armor, and the Bat Charm accessory. Rock Lump is used to create the Power Tasuki accessory.