Daughter of Light Series by Leia Stone

Now that her mother is dead, Lilly is the last of her kind.A Seeker.Tasked with seeking the lost crystals of Faerie, she must restore her broken and barren world to its former glory.But the crystals that keep Faerie alive have been stolen by the Sons of Darkness and are hidden on Earth. It's up her to get them back by any means necessary.She has everything under control and plans to bring the first crystal back, when she meets him – Liam – a Son of Darkness... moreNow that her mother is dead, Lilly is the last of her kind.A Seeker.Tasked with seeking the lost crystals of Faerie, she must restore her broken and barren world to its former glory.But the crystals that keep Faerie alive have been stolen by the Sons of Darkness and are hidden on Earth. It's up her to get them back by any means necessary.She has everything under control and plans to bring the first crystal back, when she meets him – Liam – a Son of Darkness.He's the most dangerous kind, with black wings that smoke and eyes that have seen death. She must kill him, kill him and take the crystal, but she can't.He's her soulmate. less

Everything Lily thought she knew about Liam was a lie. After kicking him out of Faerie, she decides to seek the crystals alone. State after state, she scours the country but comes up with nothing.When she gets back to Faerie, defeated and broken hearted, she finds a peace offering from Liam. Faerie needs her now more than ever and she needs Liam’s help. She must push through her heartbreak and save her world before it's lost forever.