Aenir — Garth Nix

Dream or nightmare?

The dream world Aenir is not a safe place. One wrong step can lead to danger, entrapment...or death.

Tal and Milla must fight their way through this shifting landscape. They are searching for the Codex, a magical object that will decide the fate of their worlds. Many creatures stand in their way--from the cloud-flesh Storm Shepherds to a swarm of venomous Waspwyrms to a horrifying figure named Hazror.

Tal and Milla cannot leave Aenir without the Codex. But finding it might endanger them more than they've ever dreamed...