Norse based Campaign world concept - Could use some suggestions

[the_matrix_walker]

I'm working on a campaign skerry that wandered into my head.

The notion is that it would be based on the nine worlds of Norse myth, but that it would not be apparent to the characters for a good part of the game.

The game would start with the reports of Kaiju attack, that was traced back to the discovery of a Monster Island type setting. The PCs would be of the kind you would design as an expedition to such a place. The characters would eventually discover the source of the monsters - A portal to a realm of giant monsters... (Jotunheim) The party would inevitably find their way to the monster world, where solving the problem of the biggest ones getting them through would reveal yet another "portal" (Following the roots of the world tree or some such) where they would discover yet another world.

I am not using the rainbow bridge for PCs as it will come up later and I want to reserve it for the 'gods' at least at first.




I wanted to ask the community if there are any ideas for interesting takes on the worlds of Norse myth and how they might be combined with other themes and genres... I'm considering re-imaging making Niflheim as a world in the midst of a post apocalyptic ice age for example...