Today via the Playstation Blog, Sony has announced the Co-Op Shade Survival Mode, coming to Uncharted 3 on March 13.  In this new mode, players will battle the Djinn, demonic specters able to teleport and catch fire, in increasing difficult rounds (for a total of 8).

Dip your toe in these uncharted waters when the DLC hits the PSN market on March 13 for $5.99, or for free if you're a member of the Fortune Hunters' Club. This release marks the 13th, and second to last, DLC release for Uncharted 3.