As of now, it is useable on all Heroes, and it is similar to the existing artifact, ‘Sword of Ezera’. The key differences being that it reduces damage from all sources (not simply bosses). This makes it a great pick for flimsy DPS in both Arena and Guild Wars.

(You may not want to Limit Break this artifact, as it can only be acquired a total of six times and cannot be acquired in any other way. Use powder instead to keep multiple copies. As with all event-type artifacts, this cannot be used to enhance artifacts other than itself.)

In addition to the new artifact, you can also purchase a Gold Transmit Stone once each month, as well as extra catalyst chests.

Lastly, successful defenses now award the defender with extra Mystic medals - 2 for a win, and 1 for a tie. Beef up those defenses to get extra stuff!

Guild Wars Schedule