Eldritch (The Eating Woods, #2) by Keri Lake

In the grimly captivating sequel to Anathema, Maevyth and Zevander must navigate the perilous mortal lands to deliver Zevander from the clutches of an ancient, malevolent power that threatens to shatter both worlds.

An eldritch magic has awakened, turning the mortal world darker. Colder. Famished. With flesh-eating monsters and a sinister curse spreading like a plague, the last glimmer of humanity in Foxglove Parish has long-since faded.

For Maevyth and Zevander, the only chance of escape is through The Eating Woods. But fate has woven a new web, tangling the threads of destiny, and crossing the mystical boundary to Aethyria might not be so simple.