Hard As a Rock

Many classic monsters are the results of divine curses. This includes such greats as the medusa, peryton, minotaur, banshee, harpy, and of course werewolves. Plus newer additions like nothics. The advantageous part of having these monsters be the result of curses is that worldbuilders can skirt the biology and reproduction of these creatures. There doesn’t need to be male harpies or juvenile nothics. To say nothing of trying to discipline an unruly child having a temper tantrum that can turn you to stone.