Actually, if you’ve read Assassin (Deathbringer’s Backstory), then you’d know he’s only ever killed one person. He just gaslighted the Nightwings into thinking they were dead, most often by having them drop off the grid. Sixclaws was actually one he was sent to kill, but instead just told him to leave the Queen’s army. So yeah, his kill count is one, and now he’d only kill someone if they tried to hurt Glory. And I won’t tell you who he killed or why, cause you should just read the story (it’s in the Winglet book), but you can understand that too.