Blizzard Entertainment is stepping up its crackdown on unauthorized World of Warcraft servers by filing a lawsuit — that includes RICO conspiracy allegations — against the creators of the immensely popular private server Project Ascension. Blizzard’s complaint, which was filed on June 12 in California federal court and reviewed by Complex, alleges that Project Ascension is an enormous copyright infringement operation that generated millions of dollars via in-game purchases by distributing millions of unauthorized copies of World of Warcraft. The company said of Project Ascension that it’s a “lucrative way to exploit and profit from the popularity of the WoW game experience,” and named six defendants and several companies it alleges are shell companies with the sole purpose of being conduits “for monetary transactions and to avoid U.S.…