Tenebris by Jade Lamb (signed paperback) + bookmark and stickers.

Blurb:

The Pit has been opened, and with the Sun Queen gone, darkness has taken hold in the Realm of Ljord. Monsters now reside in the city, and mortals hide in their designated district, generously given to them by the new ruler. Sariel. Drake Prince. Sun killer. The one who wielded the weapon that cast the Sun Queen down into the Pit now governs this realm with a heavy crown, tussling with guilt and managing seven districts of monsters and mortals. When whispers of plans reach him that suggest someone is vying for power and threatening the mortals he decided to keep safe, he must work with his enemy to put an end to them. Lena. Princess. The Moon. The Sun Queen's twin, Lena, felt the pain of her death across Realms and has returned from her Valkyrie training seeking vengeance. But she, too, learns of these malevolent plans and must find a way to work with her sworn enemy to save the mortals. With high-stakes action, a dash of spice, monstrous creatures from folklore and myth retellings, plus a cheeky ghoul who is falling apart, Tenebris is a dark fantasy for those who love to love a monster.