Empire Market is great and most popular Darknet Market right now. Being this big it faces the problem of constant Ddos attacks causes prime Empire Market URL to be down, and alternative link too. That means that empire market had to make more and more URLs and onion links and mirror. And the problem is that there are not too much ways users can discover a right Empire Marketplace URl.
So that's why Empire Marketplace decided to create an official site where their users can at any time discover legit URLs and onion mirrors, for instant access to Empire Market. Here it is http://empiremarketurl.com/ be sure you using it every time you you wish to enter to darknet market empire market.