Selfish Basalt (我欲のバザルト, Gayoku no Bazaruto) is a Shadow in the series.
Selfish Basalt can be found in the 7th and 8th halls of Kanji's Midnight Channel world Steamy Bathhouse. While it is one of the few Basalts that are not resistant to physical attacks, it resists Almighty Skills (including an All-Out Attack). They drop Selfish Ornaments when defeated. Selling 10 Selfish Ornaments at Daidara will unlock the Revenge Ring accessory in the shop. It also drops Coal, an item required to complete Quest 11: Acquire Coal.
Multi-target elemental spells will make short work of them, but they cannot be Dizzied and will still be able to take their turn if it comes up.
Persona 4 Golden
Selfish Basalt appears in Baths 5 through 7 of the Steamy Bathhouse within the Midnight Channel. They may drop Fluorite upon defeat.
Persona Q2: New Cinema Labyrinth
Selfish Basalt appears in the 2nd Ave area of the first Theater, Kamoshidaman. Its Basalt Rock drop is used to make the Lightweight Rod for Ryuji, Lumina Saber for Akechi and Shoulder Vest male armor. Its Basalt Jewel drop is used to make the Lightweight Rod for Ryuji, Toxoid Saber for Akechi and Breeze Scarf for Morgana.
Selfish Basalt is the subject of a Special Screening, Doing Our Part, where the party will have to defeat eight Selfish Basalts while wandering a section of the 1st Ave. The Craggy Boulder items they drop during the special screening will unlock the Healing Armlet in the shop and completing the special screening yields the Trendy Shirt unisex armor.