Why does the Giant Lizard exist when we have dinosaurs and dragons? Probably because some adventure writer needed Drow lizard-riders decades ago. But this CR 1/4 reptile offers more than Spider Climb - it's a worldbuilding engine. Harness designs become investigation clues, domestication patterns shape entire cultures, and the "anti-dragon" creates perfect misdirection. Giant Lizards don't demand stories. They're the blank space where good DMs find opportunity.