How do I get to the fire spirit in the Ruins of Time - Midle? It says the area has poisonous gas and I need protection. And nothing else. I tried equiping itens that grant Poison imunity and it didn't work.
You are missing a guardian stone. You need every elemental guardian stone to complete the post game dungeon.
Yatsuha:
Yashima Kamro (wind): Starter.
Goddess Momo (nature): After defeating Genbu, see her "torture" scene.
Hyakume (fire): The gym peepers boss.
Meiminya (earth): The catfight club boss.
Wanderer Otogi (Special): Find the 4 cards and place them on the museum basement chests (the card locations are posted in a previous post in this forum).
David (Special): After getting Wanderer Otogi, is the reward of an errand sidequest from a NPC found on the material shop in the backstreet after Yatsuha's porn debut (explained in a previous post in this forum).
Shigure:
Speed Queen (wind): After defeating Genbu, see her "torture" scene.
Konohana Sakuya (nature): Starter.
Shanbareshia (fire): Found on the Shigure's nude painting dungeon. You have to interact with one of the resting fireplaces. There is a hint inside that dungeon if I remember correctly.
Yatufusa (earth): Defeat the idol. You have to finish Yatsuha's movie masturbation sidequests.
Evangelist Karna (special): Talk to the chuuni girl after clearing the VR dungeon (she is inside the game building).
Iskandar (special): After getting Wanderer Otogi, find this stone in the backstreet (I don't remember where, but is a shining spot).
Yue:
Kazami Kaminari (wind): In Cub's dungeon boss room.
Kudagitsune (nature): In Ayakashi's mansion's dungeon (the one in which you find Yue and Kokia): There is a trap besides a well. Explore everything until you find it.
Shuten Douji (fire): Starter.
Zombie Warrior Horus (earth): After defeating the occult club girl, watch her "torture" scene.
Priestess Miohime (special): It was a quest boss in the forest where you meet Yue and Kokia. You have to return there after advancing the story quite a lot and you interact with a tree inside the forest, since you are at the post game, then you can fight her right away.
Charles (special): After getting Wanderer Otogi, find this stone at the pier (a white box should have a shining spot).
Kokia:
Lolo Lala (wind): In Yatsuha's dream world, there is an NPC who sells it for 9.999 MJ.
Bubble Lishu (nature): Enter the women bath on the hotspring dungeon.
Kyubi (fire): After the student council president dungeon (the yue torture toys dungeon), watch her "torture" scene.
Makinko (earth): Starter.
Cultist Conron (special): Clear the occult club dungeon (the futa dungeon).
Caesar (special): After getting Wanderer Otogi, find this stone at Magetsu's mountain shrine. Interact with the sacred tree after clearing the student council president dungeon (it was this dungeon or the next one).