Abyssian Infernas aka Sian (Primordial Demon and King of Pandemonia/Hell) and Calliope Barbot aka Lila (Fae and princess of Sylvan) 
 He stood, staring her down. "Calliope, understand me: you will never escape this realm." 
 She boldly held his gaze. "Abyssian, understand me: I will escape you, and when I do, I will leave rubble in my wake!" 
 As she spoke, the fire flared behind her, twin spires above her head that resembled horns. 
 His breath left him. She looked like a queen. 
 A queen of hell. 
 So, Nix will tell us a story 
 or perhaps it is reality which has just happened 
 or maybe it is something that will happen in the future. 
 Nobody knows usually what Nix talks about. 
 This is story that combines greatly 
 1. The fairy tale of the Beauty and the Beast. 
 2. The greek myth of the virgin Persephone and Hades the king of Hell who stole her and kept her forever. 
 3. And maybe, it also includes some elements from the tale of Shrek and Fiona, because there is definitely an interesting twist in the end. 
 There is a sentient castle, a sentient realm really, a cursed king who needs a second chance in love and a fearless little fae on her way to become a powerful queen and right a wrong. 
 Nix has been a gamechanger again and I cannot wait to see Orion's move! 
 I really enjoyed the last available book in the series...