Elden Ring Ranni's Quest
After starting the game, Melina finds the player to make an offer. You must accept Melina's offer and obtain the mount named Torrent, which will help you to cover the distance in the game. Then, if you travel to the Church of Elleh, which is located in the starting area of the game you will meet with Ranni for the first time. She will give you the Spirit Calling Bell and Lone Wolf Ashes.
Second Encounter with Ranni
After your first encounter with Ranni, you can find her in the tower called Ranni's Rise, located in the backyard of Caria Manor. To reach her, you need to defeat the Royal Knight Loretta. After defeating him, you will encounter a dragon in the ruins as you head towards the tower in the Three Sisters area. You don't need to kill this dragon completely. It will teleport away after its health is halved. You can advance the quest by talking to Ranni on the top floor of Ranni's Rise tower. She will ask you to talk to the three NPC in the tower. After talking to the NPCs, you need to advance the quest by returning to Ranni.
Siofra River
To progress the quest, you must travel to the Siofra River, located in the underworld. To find it, you must proceed south of the Third Church of the Marika in Mistwood. You will come across a structure with a platform that goes down to the underground world. You need to advance the quest by talking to Blaidd in this area. After talking to him, you must first talk to Seluvis in Three Sisters and then to Sellen in Limgrave. After talking to the two of them, you need to go back to Blaidd and tell him what you learned.
General Radahn and Nokron
To progress Ranni's Quest, you must defeat the Starscourge Radahn in the Cealid region. After defeating Radahn, you need to reach Nokron, whose entrance is located a little south of Mistwood, near Fort Haight. In this region, you will fight a boss called Mimic, who is your clone in appearance, stat, and equipment. Then you need to find the item named Fingerslayer Blade in this area. If you take this item to Ranni, she will give you the item named Carian Inverter Statue. This item will allow you to ascend to the top of the Divine Tower of Liurnia.
Renna’s Rise and Miniature Ranni
After receiving the item on the Divine Tower of Liurnia, you need to travel to the Three Sisters location. You will see that the seal of the tower named Renna's Rise has broken. When you enter the tower and go to the top floor, you will find a teleporter. You need to travel to the Ainsel River Main using it. You will find an item called Miniature Ranni in the first tomb that you come across in this area. After looting this item, you must select the "Talk to miniature Ranni" option in the site of grace, which is located south of the tomb where you looted the item. The first time you click on this option, you may not get any feedback. For this reason, you need to talk to the miniature Ranni several times. Ranni will ask you a favor. In order to advance the quest, your next step is to follow the river in the underground world and find the invader named Baleful Shadow. After defeating him, you will get the item called Discarded Palace Key.
Darkmoon Ring and Astel
With the Discarded Palace Key, you can open the chest next to Rennala in the Raya Lucaria Academy library. You will get the item called Dark Moon Ring from this chest. It is required to progress the quest. After receiving the ring, you must return to the area where you fought Baleful Shadow and use the platform there. This platform will take you to the area called Lake of Rot. There is a coffin in which you can rest under the red river at the end of this area. If you rest in this coffin, you will be teleported to the area where you will find the boss named Astel. After defeating Astel, you will see a sealed area. You can break this seal with the Darkmoon Ring.
End of the Ranni Quest
After breaking the seal, you will reach an area in Limgrave. In this area, you will see a hole. When you follow this path, you will see Ranni standing under the slained two fingers. You can finish the quest by interacting with Ranni.
After finishing the quest, I recommend that you go to see the two NPCs in Three Sisters again. So, you can have two armor sets.