Phantom
"Report for the night shift: nothing to report. The lamps held, the gate held, the watch held. Harl went to check a knocking valve and did not come back, but Harl does that."
— Watch log, warehouse district, the entry after which the log stopsA Phantom's target isn't the lock, the guard, or the ledger in the back room. It's the room's attention.
No clever device does the work for you. Wire, a blade, a good pair of hands, and a working knowledge of how a building sounds when nothing is wrong — you get into a room as a shadow, or as a servant nobody looks at twice, and you leave it having removed exactly the people you meant to remove.
Reading the Room tracks the awareness of everyone else, not yours — Unaware, Suspicious, Alerted — and every feature you have is built against that state. When it goes wrong, you don't stop being dangerous: you fight beside the party, turn their attention where you want it, and work your way back into the dark to start again.
Saboteur
Works on the room, not the people in it. Everything they use was already in the building — the lamps, the locks, the alarm, the pipework, the floor — rigged to fail exactly when they choose.
Culler
Works on the people. They watch a calm room, decide who matters, and remove them in order, weakest first, while the tank holds everyone else's attention.