Webzen has announced that Archlord 2 will be closing on November 24, 2015 when servers will be deactivated. While no reason is given for the closure, it can be assumed that the game was not turning the profit Webzen wished even though during the course of the game's relatively short life, over 300,000 players took part in the game with over 5M hours of game play.
From now through the end date, players will be able to take advantage of server-wide buffs, event content will be scheduled and in-game shop items' prices will be set to zero. Extra castle sieges and guild battles are also on the schedule for the remaining time.
You can read the full announcement on the Archlord 2 site.