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The latest patch features a new dungeon called Coils of Ubah Kan which offers a "brutal challenge" for six-man groups along with appropriate loot and rewards.
The instance is part of AoC's Dragon's Spine content, which became the title's second adventure pack when it released in early January, 2013. Players must fight their way into the ancient underground city of the Serpent Men in order to complete the new dungeon. Funcom says that "even more content will come to this area in the near future."
[Source: Funcom press release]