Lethal Slinkers are a rare variety of Slinkers appearing in ScareScraper mode in Luigi's Mansion 3, added in version 1.3.0. They are red and black, glowing Slinkers that instantly KO the player in one hit. They have 300 HP, more than double that of a regular Slinker. They are defeated the same way as normal Slinkers.
Lethal Goobs, a rare variety of Goobs, Lethal Hammers, a rare variety of Hammers, and Lethal Oozers, a rare variety of Oozers were also added in version 1.3.0.
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