Empire Market is fine and most popular Dark Web Marketplace right now. Being this big it faces the problem of endless Ddos attacks causes primary Empire Market link to be down, and alternative URL too. That means to empire market need to create more and more URLs and tor mirror and mirror. And the problem is that there are not too much ways users can discover a legit Empire Market mirror.
That's why Empire Marketplace decided to create a special website where their users can always discover active URLs and onion mirrors, for quick enter to Empire Market. Here it is http://empiremarket-url.com make sure to use every time you you have to login to darknet market empire market.