For his perseverance in looking to the heart of stories, Altaïr can find three very old, mostly dead legends that people only ever tell as bedtime stories:

1. Two children - sometimes female and sometimes male depending on the version of the story - were born at the same time with the same face and the same eyes, but one was bright and shiny and the other was dark and shadowy. They were both beautiful, but they could only see what the other had and not their own worth, so they were split apart by envy and greed. They fought and stole and pushed each other away until one became the sun and the other became the moon, never to be together again. Both beautiful, both worshipped, but never seen as the twins that once shared a smile. This is used as a fable for teaching children not to be covetous, lest they push people away forever, and is also why twins are usually seen as auspicious! A liberal interpretation might suggest that the twins are "body" and "soul", or god and giant, and that their refusal to value themselves and each other is what split them apart.
2. A myth for the creation of the Holy City says that mortals lived in a world consumed by total darkness until nine spots of light shone down to guide them into Asgard, where they were delivered into safety from the night. The nine spots are the nine gods and the light is "deliverance"; that is, their working together and sharing a dream of protection and care and nurturing brought salvation to a troubled world.
3. Most Creation myths or references to the core of Yggdrasil will refer to it as "a well of magic overflowing", but one particular myth takes that a little further than a metaphor. It says that the well of magic birthed all things, but one day, the Mother's first child fell into the well and drowned. Overcome with grief, the Mother wept for a hundred days and a hundred nights, and each of those tears struck the earth to bring forth new life, but her sorrow lasted until Her firstborn was returned to Her, and the skies rejoiced in Her eternal love. This might suggest that the children worlds can be reborn in the same fashion that Yggdrasil can, or it might otherwise simply be an explanation for why staying in the obsidian water from Gonnungagap will drown you and scatter your very existence. Or maybe it's just old people being weird, who knows!