Song of the Mermaid Warrior

Jordan has grown up in a world torn apart by a magical illness called the Darkness.
Humans, a broken sterile people dependent on magical races to survive, now judge each other based on the purity of the magical blood of mermaids.
Jordan, a No Blood, is considered worthless.
Along with her half-elf friend Hunter, she plans to escape the city that despises her. But when everything falls apart, she finds herself lost at the center of a magical conspiracy that threatens everything and everyone.
Fortunately, Jordan isn't one to give up. She will face the end of the world fighting. She will save the world, or die trying.