Empire Market is huge and most popular Deep Web Market at the time. Being this famous it faces the problem of regular Ddos attack causes main Empire Market URL to be down, and alternative URLs too. That means that empire market had to create more and more URLs and tor mirror and mirror. And the thing is that there is not to many ways users can get a legit Empire Market mirrors.
So that's why Empire Market decided to create an official website where their users can at any time find fresh URLs and onion mirrors, for instant enter to Empire Market. Here it is http://empiremarketurl.com/ make sure you using it every time you you have to login to darknet market empire market.