The upcoming event The Castle in the Sky is a new one for Rage of Bahamut. The event will be similar to Tears of the Moon but with a bit of a twist.
Players during this event will be required to raise a fairy. Its a sort of group enhancement project which is just really strange. The fairy is your orders personal god during this event and you will be required to sacrifice to it in order to increase its power. Everybody in your order will receive a reward for developing the fairy.
Other than the fairy function The Castle in the Sky functions identically to Tears of the Moon. A player will move through a tower defeating bosses as they move up the tower in an attempt to get closer to their fairy. While progressing through the tower the player will gain treasures of colors relating to their realm. To complete a treasure set the player will have to attack people to steal the colored treasure that they are missing. Once the treasure is complete the player will receive a limited edition rare card for the treasure. Once all treasures are completed and a player reaches the top of the tower through questing they will get another limited edition card. If I'm not mistaken it's Phantom Theif Lupin who's art suggests he's awesome, but his stats are lackluster at best.
The key of this event is to gather cards through questing in the towers to sacrifice to your fairy which is what will create order rank. Individual rank will be based on tower progression where the order rank will be based on Fairy progression.
This is a huge improvement over Tears. Previously players may have noted that I found Tears to be an awful event as far as reward payout vs what you needed to spend. Since players will receive rewards for both order and individual rankings this may actually end up worth it.
Keys to being successful during this event:
1) Gather a lot of clear water to progress through the tower.
2) Identify the cost vs gain of which cards to sacrifice. Where newer players may only sacrifice normal cards, players like me may sacrifice rares/hr to increase stats. Also look at the Bazaar for cards like Puppet Master which are only 4HP for a HR.
3) The Fairy card isn't worth it. The fairy card costs 35HP right now at the Bazaar. You can purchase seven Puppet Masters for that price. She has a max of offering 3x the points of a HR (so three Puppet Masters). Cards like Pop star may actually be useful for this as well depending on how many points are given based on rarity.
4) Treasure/Referral cards cannot be sacrificed according to an important note I read below the fairy card description.
Finally, I think part of this event is to remove some of the cards from the market. Currently cards are dropping to just ridiculous prices because people just aren't buying them but their still coming out of packs.