The two most important features to have in the online collaborative platform for your shared fantasy world project would be:
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A document format that allows users to edit the text - This allows all collaborators to contribute to the stories, characters, and details of the world.
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A platform with chat or comment capability - This feature facilitates communication among you and your friends, enabling discussions about ideas, feedback on each other's work, and coordination for world-building details.
These features together enhance collaboration and ensure that everyone can actively participate and share their creative input.