The strings of the Memories created by the Spell were made out of soul essence… at least Sunny was convinced that they were. They were strings of ethereal, silver light.
The strings that Sunny himself weaved, however, were made out of shadow essence. Although they were a perfect substitute for the strings of light, they appeared entirely black. This was the reason why the weaves of the Memories he modified were like a patchwork of light and darkness.
…The weave of the Estuary Key, however, had no light at all. Every string of its vast and intricate tapestry was black, as if created out of shadow essence. It was just like the Siege Souvenir that Sunny had made and used to kill Goliath.
Sunny stared at the jagged piece of black stone, dumbfounded.
'What… what is the meaning of this?'
How could there be a Memory such as this if he had not created it?
Suddenly, there was cold sweat on his face.
'...Have I lost a part of my memories?'