* NightmareFuel: The Nundu, which resembles a Leopard -- said to be utterly silent, gigantic, and able to wipe out entire villages just by ''breathing'' due to the diseases on its breath; it's so dangerous that the only successful kills have come from one ''hundred'' wizards working in concert. For comparison, that's ten times as many wizards as it takes to subdue the average ''dragon''.
** The Lethifold, mentioned above, would also count, due to the fact that they sneak up on unsuspecting victims and smother them in their sleep. And ''digests them on the spot and leaves no evidence of their demise.''
** The Manticore, a ShoutOut to classical GreekMythology. It has a man's head, a lion's body, and a scorpion's tail, and its sting causes instant death. If that wasn't enough, its skin is ''nigh-invulnerable to magic.'' Not to mention it can speak intelligently and ''croons'' while it eats its prey. And Hagrid possibly ''crossbred'' one.[[note]]It's a Rita Skeeter article, so take it with a grain of salt, but if anyone ''would'' crossbreed manticores with fire-crabs, it'd be Hagrid.[[/note]]
** Not to mention the only record of a Chimera being killed "led to the unlucky wizard in question falling from his winged horse".[[note]]In the original legend, after slaying it while riding the winged horse Pegasus, Bellerophon tried to fly to Mount Olympus (where the gods lived). [[JerkassGods Guess how well that turned out]] for him.[[/note]]
** Then there's the Quintapeds. According to legend they [[WasOnceAMan were once a family of wizards]] before they were [[BodyHorror transformed into monsters]] by a rival wizard family, who were in turn eaten by the beasts they created. Whether or not the legend is true, these five-legged carnivorous beasts rate five Xs, and are so dangerous the island they live on has been marked completely hazardous and enchanted so it can't be placed on maps. God help us all if those things are capable of breeding.