The World Serpent: A Raimy Rylan hunt

Demons roam throughout reality. They burrow into the myths and legends of our history, creating destruction wherever they go.
Only three young heroes stand between us and the demons: Raimy Rylan, his shy cousin Piper and their wild friend Hadley. Together these three friends travel into the depths of legend, hunting and capturing and protecting us from harm.
Now they face one of their toughest challenges yet. Jormugand, the world serpent, has emerged in the 10th century Viking era, intent on igniting a war that will spell the end of the Norse gods and all of the Nine Realms.
Raimy and friends must travel back in time to hunt him down, fighting against berserkers, monsters and even each other.
Can they beat a demon strong enough to bring on the doom of the gods?