Dimetrodon

D&D 2024 monster: Dimetrodon. Source: Volo's Guide to Monsters. challenge rating 1/4, creature type Beast, Medium size, speed 30 ft., swim 20 ft. This sail-backed reptile is commonly found in areas where dinosaurs live. It hunts on shores and in shallow water, filling a similar role as a crocodile. Beast Medium 30 ft., swim 20 ft.