Krynja and the Serpent
Krynja battled a primordial serpent and was fatally wounded, and lost an eye. She killed the beast and its bones became the foundation of the earth, after creating the world a fang, that was lodged in the goddess fell into the world, it came to be known as the Evershard. Having used up nearly all her energy she merged with the newly formed universe and gained omniscience.
There's a "morning star" known as Krynja's Eye
Pretty much restricted to Krynja's cult
Variations & Mutation
In some versions she's the serpent's daughter
The Norns latched onto the "sacrificing body parts for knowledge" bit and now perform ritual amputations