The crown

I can’t remember the word for it, but sometimes a word represents a greater concept. Like saying, the crown rules, a kingdom. In the kingdom of the Westlands, the Crown literally rules the kingdom. It is a sentient powerful artifact that takes over the mind of whomever wears it. It has passed down through the royal family. With some rulers, is satisfies it’s lust for blood, engaging in wars and purges. With others, it’s satisfies it’s colonel lust with orgies and banquets. As the body succumbs to excess, a coronation is planned, and the crown prepares to rule once again.