Iris will be down for approximately 1 hour at 9pm GMT for an emergency maintenance. There will be a small patch to download so run your launcher to start the game and get the update otherwise you won't get online.

Notes:

The main reason for the maintenance was to relocate the server to more secure and more powerful hardware. You should see a big improvement in server response, and no lag.

Some of the new costume set effects were fixed. Plate bonuses were wrong and also the agility bonus on the mail sets.

Scout's Conflagrated Barrage cooldown and damage corrected.
Knight/Guardian skills adjusted as mentioned in this post