Irrational has announced details about the three pieces of DLC in BioShock Infinite’s

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“ It’s really a story of Booker and Elizabeth again, but set against the backdrop of pre-fall Rapture.

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“ We did some tweaks to the various Vigors. There’s a new Vigor. There’s a new weapon. And a new Plasmid – they’re called Plasmids in this.

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“ When you play Elizabeth, it’s even more towards a survival horror game.

Clash in the Clouds, a combat-focused set of challenges spread across Columbia, is available starting today on Steam, PSN and Xbox 360 and costs $5 for anyone who doesn’t own the Season Pass. Clash in the Clouds includes four challenge maps (The Ops Zeal, Duke & Dimwit Theater, Raven’s Dome and Emporia Arcade), each of which contains 15 waves of enemies. Each wave includes a Blue Ribbon Challenge with a unique, difficult objective, and leaderboards will track your scores on each map and allow you to compare with friends.Clash in the Clouds also includes the Columbian Archaelogical Society, an in-game museum players can explore to view character models, concept art, behind-the-scenes videos and more. Players will also be able to access new Voxophones and Kinetoscopes that provide additional insight into Columbia’s lore.Additional content for BioShock Infinite will come in the form of Burial at Sea, a two-part episodic story that will make up the remaining two pieces of DLC for Season Pass holders or will be available for $14.99 each for everyone else. The first episode of Burial at Sea is set in Rapture on December 31, 1958, the night before the famous fall of Rapture. Players will once again take on the role of Booker DeWitt, but in new circumstances that include a new, noir-like version of Elizabeth. A second episode will allow you to play as Elizabeth, but Irrational hasn’t released many details yet other than saying that her gameplay will differ from Booker’s, and is “almost survival horror.”In an interview with IGN, BioShock creator Ken Levine provided additional information about Burial at Sea, including insight into playing as Elizabeth and how the DLC will reconcile Columbia and Rapture’s gameplay differences.According to Levine, Burial at Sea will reconcile the idea of having Booker, who uses Vigors in Columbia, living inside of Rapture, where Plasmids exist instead. He explained that players will use Plasmids (which were injected in BioShock 1), but that they’ll be drinkable like Vigors.Levine also explained that Elizabeth will be a very different experience for the player, moving back to the scary feeling in BioShock 1.“When you play Elizabeth, it’s even more towards a survival horror game,” he said. “I just played the first prototype of her the other day. We’re almost in beta on part one of the Rapture one. We’re at sort of early stages of the second part, where you play Elizabeth, but I’ve played a prototype of what it’s like to play her. It feels very different. We’re mostly working on the systems side to make things feel different.”Beyond the tone, Elizabeth will also be more “fragile” than Booker, with gameplay more about setting traps than shooting guns.Levine also hinted that "it’s important that Elizabeth is a person of multiple dimensions," but wouldn't say more for fear of spoiling the story. As for why the DLC won’t be set in Columbia, Levine said it’s as simple as a good idea that was stuck in his head.“There were some Columbia ideas we kicked around, but I think we also got to the point where we felt like that was the story that we had just told. We had told it to the extent we wanted to tell it,” he confessed. “But I had this image in my head of this moment in this detective’s office, Booker’s office. Elizabeth walking in dressed like Veronica Lake. And I just fixated on that.”No release date has been announced for either Burial at Sea episode, though episode one will enter beta soon. Irrational has said in the past that all DLC in the Season Pass will be released before the end of March 2014. Keep checking back to IGN for more on BioShock Infinite’s upcoming DLC in the weeks to come, and for much more on everything BioShock Infinite, be sure to consult our BioShock Infinite wiki

Andrew Goldfarb is IGN’s news editor. Keep up with pictures of the latest food he’s been eating by following @garfep on Twitter or garfep on IGN.