After the player has completed the Path of the Mage, if they continue unlocking skills for the Mage Spirit that reach a total of 36 or more Ectoplasm invested, the Guide Spirit will transform into the Mage Spirit's form and tell the player that the Mage wishes to speak with them.
The memory activator from the previous visit to the Mage within will re-appear and the quest will start with an objective to speak to the Mage within the Sigil Geode.
There is a point during the quest Grave Encounters where the player will be tasked with making a final choice. Once the player reaches this point, they will no longer be able to gain access to or complete this quest until after Grave Encounters is completed. The player will be urged at several points by the Guide Spirit to continue empowering the spirits until these quests are completed if the player wishes to do so before continuing with Grave Encounters.
Inside the Sigil Geode, the Mage Spirit - which the player will now know as Elyssia - will tell the player she understands the unfinished business which keeps them tethered, and asks the player to help her resolve it.
She asks the player to perform a ritual, with the help of the Guide Spirit, to summon the deceased spirit of her mother, and bind her to the Scepter of Infinite Chorus as a way to teach her a lesson for how she had treated Elyssia in life.
If the player agrees to do this, they will be told to retrieve a bone from her remains, and an objective will point the player to the coffin where they first found the Mage's body in the "Mage wing" of the Soul Sanctum.
Once the player retrieves "Elyssia's Remains", the Guide Spirit will speak to the player and tell them she doesn't think proceeding with binding the mother is a good idea. The player can then ask if something is on her mind and eventually ask for an alternative, to which the Guide Spirit will suggest that perhaps Elyssia just needs to hear certain things from her mother to move on.
The player's next objective will point them back to Bthunduum, at the base of the "Thought Tower" where Elyssia had fallen to her death. The player will find a blood stain there.
As they approach the location, the Spirit Guide will appear in the form of the Mage Spirit. She'll tell the player that she's going to perform the ritual, and then summons the spirit of Elyssia's mother.
From here the player will have a conversation with her mother and can ask a series of questions to find out about their relationship. The player can then choose to continue with the binding, or let the mother go free.
If the player chooses to proceed with the binding, they'll first have to fight and subdue the mother. Otherwise, she'll fade away again. Either way, the player will then be directed to return to Elyssia inside the Sigil Geode and tell her what happened.
After the player tells her what happened, Elyssia will thank the player and teach the player more of the Scepter of Infinite Chorus, increasing the maximum number of motes it can summon and the amount of damage they do.
The player will be returned to the Soul Sanctum, and the quest will complete.