The Thing/One Blade Description

 One-Blade stalked back in front of me and looked at me with empty eyes. He’d just showed me everything I needed to know about his proficiency in combat. He was quick, strong, and ruthless. It’d be one thing to get out of the chair, another to get past him. Then there was the big guy in the corner. He’d handled Gow without a scratch. Even I couldn’t do that.

...

I guessed his age at thirty-five. Late physical prime. With a decade of hit work under his belt. Wraith had been right. The Labyrinth was a proving ground. The guys at the lowest Depths were the best of the best. Seasoned killers. Government-funded assassins. The guys Presidents sent to take out their highest-value targets.
-Sledge vs. The Labyrinth, pg. 249-262