The Witch and the Shadowsinger

Asterin Blackbeak had been born during a time of peace yet she had never known any.
After the war, Manon gives birth to her firstborn child, a beautiful girl with all of her mother's physical traits carrying inside of her the magic of the witches and the raw magic given to her by her father, the King, Dorian Havilliard.
Being so powerful from birth made Asterin be hunted by all kinds of creatures, some to claim her as their own, others to kill her but being Manon's daughter made Asterin become a skilled warrior and a very powerful witch surpassing her own mother before reaching adulthood.
Manon loved Asterin more than anything, especially after Dorian's death as her daughter was the only piece of him she had left.
Keeping always on the move and under a constant glamour Asterin was able to survive up to her 118 birthday before Manon was brutally killed, Asterin had but one option, to run and so she did but in a moment she was in the Witch Kingdom in Erileia and the next she was falling through the skies with snowcapped mountains approaching too fast.
What happens when a witch meets a shadowsinger in a whole different world?