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Lethal Goob is a kind of rare ghost in Luigi's Mansion 3. It is a form of Goob, but they are brown ghosts glowing red, they will only appear in the ScareScraper's twenty floors mod, on the tenth floor. They have 250HP, more than the double life of a Goob. Lethal Goobs appeared after the update in 2020.
Lethal Goobs is one of the forms of Goob, instead of having blue bodies and white eyes, they have red and black bodies with red eyes. They are defeated in the same way as any kind of Goobs.
Lethal Goobs can deal with heavier damage to Luigi. They won't appear when the doors open, however, they will appear after the door opened for a while. In order to defeat Lethal Goobs, Luigi needs to flash them and vacuum them up.