Defenses

Consider adjusting your creature's HP, AC, and saves in tandem based on its theme. Almost no creature has great defenses in all areas, and such creatures often result in frustrating fights. A creature with extreme AC might mean reducing its HP to the next lowest category, or reducing its HP by a smaller amount and making another reduction elsewhere. On the other hand, a creature that's easy to hit could have more HP and a strong Fortitude save to compensate.