Batuk
"Yes. Rosina's cousin. He was one of the Presbyterate's border-guards: the Gracious. But they discharged him when he allowed an explorer access to the Interior. An explorer..." she taps her teeth, thinking. "Lorenzo? Afterwards, Batuk became a mercenary, and joined our number."
"He'd had enough of discipline. He will have sought a place of freedom."[1]

Commander of the armies of the Seven and cousin to Rosina, Batuk is a cold and reserved man, making him the perfect candidate to rally and lead armies into battle against the seemingly infinite masses of the Presbyter. Before joining the Seven, he was a border guard for the Presbyterate, but he was stripped of his position for allowing a surface explorer to enter.[1]
As a soldier, he took responsibility for the failure of the campaign, claiming he charged at the city while not noticing an approaching army.[2] Angered and embarrassed by his loss, he has since rejected the world and fled to Nook, where no one cares about the outside. He may claim he no longer cares for immortality, but he just needs a bit of encouragement.[3]