Snowdrop
Wayvern found a room that was mostlty a stained glass window depicting a young white and light blue Pegasus surrounded by snowflakes. There was a jar in the same room that looked to be very cold, a fact that was confirmed when Wayvern touched it with his wing.
"This is Snowdrop's Memorial," a voice said behind him. He turned around to find Luna looking at him with a warm smile, like she understood something he didn't know about. "She was a friend of mine."
"Was?"
"A thousand years ago, she invented the snowflake." Luna said. "The feat was very impressive. though the product was underwhelming at the time, the effort was undoubtedly a struggle, because she was blind."
"What did it look like?" Wayvern said. Luna pulled out a crystal replica of the flake that Snowdrop made. It was asymmetrical and sloppy, but it was beautiful nonetheless.
"She understood the beauty in all things better than anyone, even though she could not see it. It's partly because she died that I became Nightmare Moon that very year."
"I'm so sorry."
"Don't be, you understand how it was better than anypony." Wayvern was confused until he remembered Avalanche. Avalanche died because Wayvern couldn't do anything to help him.
"So Snowdrop was like a Teacher to you?"
"In a sense, yes." Wayvern turned to the jar and knelt before it.
"I wish I could've met you, Snowdrop," he whispered to it. Behind him he heard the clopping of hooves on the tiles and he and Luna turned around to see Twilight with a baby Dragon running their way. When she got to them she was panting.
"Wayvern… is this… the dragon?" she said between breaths.
Wayvern looked at the dragon and recognized it from the dream. Now Wayvern remembered that moment as one of his father's memories… somehow.
"It looks like him, but it can't be him, that dragon died eleven centuries ago."
"But I'm Spike," The dragon said.
"Then let me check something." This was the first time that Wayvern used Magic practically. The spell he used checked biological history as visions towards the caster. The memory in the dream came up among others.
"The Spike I remember is this Spike's Ancestor."