Planescape and Spelljammer were mood setting. They can be reconcepted to the default cosmilogy and still retain the mood if done by the right people.
As for Mystara I'll echo the general sentiment that there were some excellent gazeteers (Glantri, Karameikos) alongside some terrible ones. I think the best way to use them would be to make them optional locations inside the default World.
As for Mystara I'll echo the general sentiment that there were some excellent gazeteers (Glantri, Karameikos) alongside some terrible ones. I think the best way to use them would be to make them optional locations inside the default World.
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