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“It is done. The Artifact Defense Event is no more.”
This event has concluded on all platforms.

Attention all Tenno,
We have found three rare Artifacts in transit throughout the system. We believe that enemy forces may have obtained knowledge of these shipments and are moving to intercept them. The Artifacts will be in transit for the next three days. If an Artifact is threatened, I will send out an alert beacon requesting defense forces. Attacks could come at any time and these artifacts are vital to our cause. Stay vigilant.

The Artifact Defense Event started June 21, 2013 at 5PM (GMT) and ended on June 24 at 5PM (GMT).

This event is focused on special defense missions, which would commonly show up as alert missions during the event. These mission can be identified by their name, Secure the Artifacts. Each of the event's missions rewarded one of three new Artifacts: Mod TT 20px.png Corrosive Projection, Mod TT 20px.png Shield Disruption, and Mod TT 20px.png Infested Impedance.

All of these missions are of defense type and require Tenno to survive a variable number of defense waves against any of the three factions.