Will was young when he had wandered onto the titaness territory. He had always been curious about the mysterious house that took people's memories. He slowly walked up to the front door, it suprised Will that he found it open. A woman with long wavy hair was sat cross-legged on the floor with her eyes closed. Smoke from a fire filled the room. To Will's surprise he could breathe just fine. He sat himself down opposite the titaness. She had a permanent frown on her face.
"Hey, I'm Will. What are you doing?" He beamed.
"Hello, son of Apollo. I am Mnemosyne. I'm remembering a more pleasant time than this. What brings you here, demigod?" Her voice was slick and smooth.
Will thought for a moment, "Mayonnaise," He said, "is it true that when people come here that they lose their memories?"
The Titaness scowled, "Mnemosyne. That is somewhat true. Most people who come to my home lose their memories because they don't have the mental capacity to handle all of their memories at once. That is how I test people, young demigod. I bring forward every memory that person has and force them to remember them all at once. Those who pass my test I train."
"How do you pass the test?"
"Don't die."
"Those who pass. What do you teach them?"
Mnemosyne laughed, "Oh, you precious demigod. I teach them how to change memories, how to erase them, how to warp someone's perception of reality, how to locate lost memories... There is so much more, little demigod. Do you really want to take my test?"
Will nodded eagerly. Mnemosyne smiled evilly. She placed her hands on his chest and forehead. She located every one of his memories and brought them forward into his conscious mind. She felt the multiple paths in Wills mind reconnecting all at once as he relived every moment of his life. Wills body convulsed violently. Mnemosyne pulled away and was surprised to see that Will didn't die. He threw up and then blacked out for two days.
Many years later just before Mnemosyne's final test (which was to let him go and fend for himself) the Titaness taught Will how to bring forward every single memory of a person at once. Will often wondered what life would be like without the Titaness being around him. Will had faint memories of his mortal family but he suppressed them as much as he could. After all of his years with the Titaness of memories he never thought he would use his newfound powers on the king of the Gods.