Campaign Concepts: A Sundered World

Something that I kicked around since this morning is a D&D campaign, where during the Dawn War the primordials destroyed the world before they were bound and sealed away. They figured that if they can't have the world, then no one should. The destruction created last masses that drift through the Astral Sea, some still capable of supporting life. The mortal races fought territorial wars for the largest, most bountiful ones, sometimes destroying them in the process (as is the case with Arkhosia and Bael Turath).

In this campaign, the players could sail around the Astral Sea at 1st-level, engaging in politics between merchant guilds and territories, fighting off pirates, and exploring uncharted land masses and/or astral dominions. Due to the fluctuating nature of planar boundaries, the Feywild and Shadowfell could have an increased or reduced influence. There could be entire land masses filled with undead, crippled spirits, or fey kingdoms. Ultimately, I would expect the campaign finale to be where the players reconstruct the shattered world, but can't really think of anything to go in between.