Sigh... I can't believe we have to start all over again...
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Starting on July 26, 2016, Revival Events have become available in between regular events. They allow you to collect cards from past events, even if you weren't playing the game during an event's original occurrence.
As of March 31, 2021, the Revival Events are obsolete.
Starting a Revival Event
0. If any of your teams are weaker than 250,000 total strength, don't attempt a revival event. Your teams are too weak to succeed without wasting lots of resources. Note that if you finish a revival and then restart it, your points will be reset to 0 again, so you can't use multiple revivals to slowly build up to a card.
1. Enter the Revival Event tab on the map screen.
2. Select the Revival Event you want to participate in. For this demonstration, let's say you want to start The Flag's Honor ✻ Crowned Flower Festival. (If you can't find the event you want to revive, then it happened too recently to revive. At the end of each event, the next event in chronological order are added to the revival list.)
3. To read more about the event, click the "More info" button; to start it, click "Spend 15 dia to start this Revival Event".
If you click "More info", you'll be presented with this screen.
Once a revival is started, you'll be presented with a screen like this.
Clicking "Check Schedule" will show you what periods of time you have to participate in your revival. For example, this schedule indicates the five three-day periods of May 11-13, May 26-28, June 11-13, June 26-28, and July 11-13, all of 2017. Depending on when you start your revival, you may not have five three-day periods. Instead, you may have four three-day periods, a two-day period, and a one-day period.
Differences from Normal Events
Revivals are mostly the same as regular events, save for these differences:
Cards cannot drop from lives, no matter their rarity.
The gacha bonus from the previous regular event carries over into the following revival period. The gacha available at the time does not get a gacha bonus. So, in our Flower Festival example, the Palace of the Ocean gacha wouldn't get a gacha bonus; however, the current gacha (at the time of writing, that's Biblio) would keep the bonus it had in the previous event.
You can access all four event courses from the start; however, the second challenger won't start appearing until the eighth day.
You can't get multiple copies of any cards. If you got a card in a previous revival attempt or when the event originally released, you won't be able to collect another copy of it. (This goes for all rarities and types of card.)
The amount of points required for a card depends on its rarity, as well as whether it was points or rank.
Points cards always require the same amount of points, as shown below.
Rank cards require a variable amount of points, based on how many points were needed to get at least one copy when the event originally released. (Some liberties are taken with very early events, since their cutoffs were extremely low due to the game having only just started.) The requirements are shown below.