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The Secret World just turned one year old and Funcom is celebrating the occasion with an anniversary event called Guardians of Gaia. The event will be running from July 3rd to July 8th, with some parts of it being available all the way until July 15th.
I made an event guide for the anniversary event, and thought of sharing it here as well. You can find the guide over at This way to the Hollow Earth. The guide contains a ton of event related information packed together with lots of images about the rewards and monsters, lore locations and such.
The main feature of the event are the nine gigantic guardians of Gaia, wandering around the playfields. Rewards for killing the guardians include fashion accessories such as eye patches and monocles, and 9 miniature sized versions of the 9 gigantic guardians as pets. There's also a daily changing double AP/XP/etc bonus during the event.
There's also an official developers letter about the anniversary.