- OrderedComa
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- Noble Member
Mendicant Bias shows up during the trial of the Master Builder and takes control of five of the Halo rings and battle opens between the Forerunners and the Sentinels. Six of the Halo rings flee the battle and make it safely to the Ark, Bornstellar/Didact and those other Forerunners in his shuttle get to the Ark as well with the wreck of a Halo ring and meet the Librarian. The Didact's memories and Bornstellar effectively merge and Born basically becomes the Didact and remembers the words of the Prisoner/Last Precursor.
I would assume that the ring Mendicant Bias had that had been missing for so long is probably Delta Halo (the one in Halo 2), and I think it's pretty obvious that the Last Precursor is somehow connected to the Gravemind, so Mendicant's Ring being Delta Halo makes a lot of sense.