Lucinda and Lyria

Lyria and Lucinda were best friends.
They were faeries.
That was normal.
Until Lyria the perfect, good little 'angel' accidentally murders Lucinda's only brother.
Then all hell breaks loose.
Lyria is good.
Lucinda is evil.
Brother against brother.
Sister against sister.
Friend against friend.
Good against Evil.
Light vs Dark.
Who. Will. Win?