MJ Nachta
Master Nachta Bloodheart; a Master of the Arati brotherhood. She's some 200 years old (well, was, when MJ was going, before the switch). She had an unusual bond with the Source, which is the source of Arati power, and a piece of her soul was bound in her sword; together, these things kept her from aging.
She suffered tragedy some thirty years ago, when a Caladar she was teaching, a girl named Viria, was killed while under her care. She could not forgive herself, and gave up teaching Caladar at all. She took a lot of dangerous scouting missions after that, and then, about two years ago, was captured by dark elves while spying on them.
She was tortured for a few months, and was about to be sold, when the PC Arati showed up, gating in for a complete other purpose, and found and rescued her. When it became clear that the other masters were missing, possibly dead, she agreed to set aside her old pain for duty's sake, and took them as students.
She's one of the only Arati who didn't want to rejoin the Ring. She's tasted immortality; watched babies grow into children, and adults; befriended them, loved them as family; and then watched them grow old and die. It was painful and then some; the only way to survive immortality is to stop caring, and that's not something she could ever do.
The dark elves had taken her sword when she was captured, and when her students finally regained it for her, the portion of her soul within had been destroyed, and she was dying. Alanon gave his life to reset the balance; as the only living Master, she had to live, to pass on the teachings. His name will be honored, forever.