Where and when it shows up
Spawns after a patient dies. Floats freely through the whole hospital and goes invisible when you get close.
Because a Ghost only spawns after a patient death, the real prevention here isn't a Ghost-specific tactic — it's minimizing patient deaths in the first place (correct anomaly identification, not misfiring the taser or gun on normal animals). Once one's active, the −2/second drain adds up fast if you don't hunt it down, since it follows you through multiple rooms rather than staying put.