Describe the creature you need — a "swamp witch," a "clockwork guardian," whatever the encounter calls for — set a target Challenge Rating, and optionally a type, size, and combat role. The generator returns a complete 5e monster stat block: ability scores with modifiers, AC, hit points with hit dice, speed, senses, languages, and a CR with matching XP and proficiency bonus.
It builds the numbers to match the target CR using standard 5e monster math, then fills in fitting traits and actions — attacks, special abilities, and legendary actions where appropriate. Copy the block as plain text, download it as JSON, or save it to your browser for later. Always give a generated block a quick once-over before you run it.