Ghargatula

taotad's picture

Ghargatulas are 25 ft. tall terrors that have been mistaken for fiendish dinosaurs.
They wander about the warmer layers of Baator, killing anything that they can eat (which is most things). They are also employed as guardians in important palaces and Unholy locations of dark importance.

Source
Book of Vile Darkness (WotC)

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