As Long as the Raven Flies

Take out all the Christian imagery and symbolism from NGE, and replace it with gods of two European cultures that were eradicated by the followers of Christ: the Celts and the Norse. Now, face the rulers of the ancient world. Ragnarok approaches, but can it be stopped? Today, the old gods live again. Today, the old gods die with them...but not so long as long as the raven flies.