The two most important features to have in the online collaborative platform for your fantasy world project would be:
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A platform with chat or comment capability - This would allow you and your friends to discuss ideas, provide feedback, and communicate effectively about the stories and details in your shared world.
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A document format that allows users to edit the text - This is essential for collaboration, as it would enable each person to contribute their stories, update information, and make changes to the shared document.
These features support effective collaboration and real-time input from all participants in creating and maintaining your fantasy world.