NCsoft is dangling a few goodies in front of current Aion subscribers in the form of their revamped Refer A Friend program and its myriad incentives. If you've got an active account that's over six weeks old (and have paid for at least six weeks of game time), you can log into your NCsoft Master Account and click the Refer A Friend link in the Actions section to get started.
If your referral purchases either a retail box or digital copy of the game, you'll be gifted with three Major Ancient Crowns, currently valued at a whopping 6400 AP each. If your referral signs up for one month or more of Aion game time, you'll get a free paid month credited to NCsoft Master Account. Your friend isn't left out either, as NCsoft will email each referral a serial code that includes XP bonus items, running scrolls, courage scrolls, and recovery serums.
Check out the official site for all the details and regulations.