I've always loved the Halo Universe, it has so many stories to tell! One that always made me a little sad was the oppression against the Unggoy, and their rebellion against the Covenant. I thought it so cool that they earned the respect of the Sangheili.
What stories from the Halo Universe has always interested you?
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The story of Mendicant Bias always was interesting to me. Both his defection, and his redemption.