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During this event, the player earns Numbers Reports by Dueling in Duel World (except at the Gate or against The Vagrant) or Ranked Duels. The first two times the player earns Numbers Reports from a Duel per day, they receive 10 bonus Numbers Reports. This amount was increased to 20 Numbers Reports on November 1, 2020.
Reginald "Shark" Kastle can be challenged as Possessed Shark in this event. He initially appears with his Level 10 Deck in Duel World (ZEXAL). After defeating him and collecting 30 Numbers Reports, he will spawn again in Duel World, but with his Level 20 Deck. Defeating him again will complete Challenge 1, which will make him start appearing in Duel World (ZEXAL); this appearance is time-based.
After completing Challenge 1, he will also become available to be Dueled against at the Gate. At first, he will only be able to be challenged at Level 10. To challenge him at higher Levels (up to Level 40), the player needs to defeat him at least once at the highest available Level (e.g. he needs to be defeated at Level 10 before he can be challenged at Level 20).
In order to challenge Possessed Shark at a certain Level at the Gate, the player needs to spend a corresponding amount of Numbers Reports, which is as follows:
From October 30, 2020 onwards, Shark can appear in Duel World (ZEXAL) as "Raging Shark". In order to spawn Raging Shark, the player must fill a Mood Meter by Dueling in Duel World or in Ranked Duels.
Raging Shark always goes first. He uses the Skill "Give Up Already!", which forcefully ends the Duel in a draw at the start of the opponent's turn from the 10th turn onward.
Raging Shark initially has a large number of LP depending on his Level. If he is not defeated, any damage inflicted upon him during the Duel is carried over to the next Duel. (However, if the player surrenders, any damage dealt during that Duel is not carried over.) This allows the player to chip away at his Life Points over several Duels. The player does not receive any EXP, Duel Rewards, or Event Points from Duels with Raging Shark unless they defeat him. Challenging Raging Shark costs 10 Numbers Reports per Duel (for Level 100 or lower) or 20 Numbers Reports (for Level 120 or higher) per Duel.
Xyz Monsters deal five times more battle damage to Raging Shark. If one of the player's friends defeats Raging Shark, they will also decrease Raging Shark's starting LP next time he is Dueled, although he cannot be defeated by damage from a friend.
Raging Shark initially appears at Level 50. Each time the player defeats Raging Shark, the next level is unlocked (up to Level 100, in increments of 10), with only that level of Raging Shark appearing from then onward. After completing Challenge #4 (defeating Level 100 Raging Shark after November 1, 2020), Raging Shark will begin to spawn at Level 120 and higher (levels are unlockable up to Level 200, in increments of 20); at these Levels, in addition to "Give Up Already!", he also uses the Skill "Shark's Pride". Once Level 200 is unlocked, instead of only one level being possible, any of Level 200, Level 260, or Level 300 Raging Shark can appear.
If Raging Shark is defeated, he gives a 10,000 Duel Assessment bonus that guarantees the player always receives the maximum eight rewards. The only cards he can drop are event-exclusive cards, regardless of level. In addition, a ×20 multiplier is applied to the Event Points earned from the Duel, and the chance of Rainbow Packs appearing is increased.
During the Duel, "Number 32: Shark Drake" appears in the background, and reacts to taking damage and being defeated.
Challenges are made available throughout the course of the event. Once a Challenge is available, the player can unlock it by fulfilling its unlock condition. With the exception of the first, each Challenge is unlocked by collecting a sufficient number of Event Points and completing the previous Challenge.
When a Challenge is unlocked, a special character will spawn in Duel World (ZEXAL). The character appears as an opponent who does not provide any Duel Rewards. After defeating them, the Challenge is completed, and a cutscene plays. During the event, previously viewed cutscenes can be watched again from the Scene Album on the event page.
When the player clears Challenge #3, Reginald "Shark" Kastle is unlocked as a playable character. During this event's second run only, when the player clears Challenge #4, they also unlock the Skill "Full Armored Xyz [Black Ray]".
In this event, the player earns Event Points by Dueling Possessed Shark and characters that spawn from Challenges. The player earns a number of Event Points equal to their Duel Result, multiplied by the Point Multiplier for that Deck level.
An EX Jewel (Shark), named EX Jewel (Reginald Kastle) during the 2020 run.
The Card Trader EX appears during this event and remains open until one week after its conclusion. The player can trade their EX Jewels for cards, Booster Items, Gold, and Skill Chips. Each card and Booster Item can only be obtained once from the Card Trader EX during this event, but the Gold can be obtained any number of times.