The Alpha Queen

A normal teenager named Clair has been living a normal life, or at least she thought. One day, she suddenly has a mysterious dream with someone threatening that she should be scared of him. Soon, she starts travelling to another world in her dreams to train against the mysterious person and learns that she was in a 'legacy' to beat him, but there's another part of the legacy that Clair has no idea about, where her fate will take darker turns. What will happen to her? Why are people not telling her the legacy? Will she win this war?