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The Basilisk was a scheme cooked up by Leo Sunburst, the mayor, and the butcher of a small town to get their town in the news.
It was a yellow humanoid resembled somewhat of a gargoyle, with wings, a tail, and bulging black eyes.
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Powers and abilities
It was supposed to be able to turn people to stone with a look.
Scooby-Doo (DC Comics)
The conspirators got a sculptor, Dustin Chalk, to make lifelike statues of people (including the gang, since they wrote for them to come and had pictures to refer to). They planted the sculptures and told the story of the monster (they also had a real monster, who chased Fred and Daphne).