The Yther Chronicles

The Nightmare Queen's sinister sleep spell is broken, but she isn't
going to give up without a fight. She challenges the heroes Coleus,
Abby, Lademer, Blustera, Cayla and Matt to a challenge in her
own realm, the dimension of true dreams. At first glance, this
challenge appears similar to a board game, with the six adventurers
as pieces. It soon becomes evident that it is far more than that.
Guided by a mysterious dream creature, the six heroes must pass
through seven bizarre dreamscapes, each contaminated with the
Nightmare Queen's evil energy. From volcanic watselands to lush
jungles, from an endless road to the peaks of a frozen mountain
and even into outer space, Coleus and his friends move ever closer
to the center of the gameboard, and the Nightmare Queen's
hallucinatory stronghold.