Megamillipede

Megamillipede is a species of gigantic arthropod that is descended from a prehistoric group of Arthropleuras that were saved from extinction and were genetically engineered to tolerate low oxygen levels as well as predation and competition. They are the largest native real life purely land arthropods on Earth, about the height of a man when rearing up and as long as a truck or a car. Although Megamillipede's diet consists of mostly plants, and it is carnivorous as a juvenile, because they aren't developed enough to have the ability to properly digest plants until they matured. Megamillipede's ancestors was one of the first land animals to eat plants. Although they are vegetarians, they have strong jaws and can deliver a nasty bite, but they are not poisonous. For defense against predators (such as bears, wild dogs [wolves, African wild dogs, etc], big cats, etc), they are large and they have thick armor so the predators aren't likely to kill Megamillipedes easily. They also rear up tall enough to look humans right in the eye. Because rearing up is a defensive reaction, they probably could spray like native modern millipedes and centipedes that secrete cyanide, but this is unknown whether it is true or not for megamillipedes.