Kabr, the Legionless
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Kabr was part of a three-person fireteam, alongside the Warlock Praedyth and the legendary Hunter Pahanin. About five years into their time working together, Praedyth helped Kabr craft a helmet for himself; six months later Kabr cracked it in half while fighting in the Crucible 
Along with many other Guardians, Kabr and his fireteam participated in the Great Ahamkara Hunt.
The Vault of Glass
Kabr attempted to raid the Vault of Glass with his fireteam, but they found themselves unable to get past the Templar and its oracles. Kabr crafted for himself a set of armor from the bodies of fallen Vex, which began to affect his mind and gradually assimilate his body. Before the end, Kabr's last words were recorded by Pahanin, who described Kabr as "a good man." It appears that everyone from his fireteam, except for Praedyth and Pahanin, was erased from existence by the Oracles, and that not even Kabr himself could identify who his teammates were; he explains, "No one can open the vault alone. I opened the vault. There was no one with me but I was not alone." In the end, when his team was lost and his Ghost was taken from him, Kabr was determined to not die in vain by forging his light into The Aegis, a shield of incredible power that could change fate itself and defeat the enemies of the Vault.
Years after the original fall of the Vault of Glass, an intercepted transmission from the Vex Collective claiming to be Kabr's consciousness was discovered; said transmission stated that it had uncovered the true nature of the Vex's perception on Light and Darkness, seeing them as basic threats to survival rather than true enemies. It is unknown whether this is truly Kabr speaking, in defiance of his last words, or merely a Vex simulation of his memories and personality.
The following quotes come from the descriptions of Kabr's armor, Battlecage of Kabr, Kabr's Brazen Grips, Kabr's Wrath, and Kabr's Forceful Greaves:
List of appearances