The worst punishment available to the dungeon for a rule-breaking NPC: reassignment as undead.
When Milk recalls the procedures governing her status as a Non-Combatant NPC, the punishment ladder ends with undead reassignment, which the rules themselves label the worst fate. It sits above additional time on her Indentureship contract and above Reassignment to a Combat Role. Knowing this, Milk still chooses to warn Miriam and Prepotente about the guards, accepting an Unauthorized Information Warning and then inviting a staged threat so she can hand over Milk's Map.
The ultimate deterrent hanging over every indentured NPC who considers helping crawlers.