Nightingale followed the path she had scouted out before, passed through three rooves, and landed straight in the dungeon that the Marquess was held.
Spear Passi heard the sound and stared up with wide eyes. "How... did you get in?"
Nightingale raised a finger to her lips as a sign for silence and limped out of the steel door. Judging from their clothing, the two guards in the pathway were probably followers of the church. She used the Mist to instantly move behind the two men and slit their throats with a dagger—they would never have expected an attack from within the dungeon, so they didn't even turn their heads as they lay dying.
After returning to the dungeon, Nightingale finally had a chance to examine her wound.