The XIII Event (XIII機関イベント XIII Kikan Ibento?, lit. "Organization XIII Event") is a recurring Event in Kingdom Hearts Unchained χ / Union χ. It starts on the 13th of each month, and grants players a Medal and Avatar Parts based on one Organization XIII member.

XIII Event - Number 1

 
 

XIII Event - Number 1 focuses on Xemnas and was available from January 13 to 19, 2017 in both versions. Players could obtain the Xemnas B Medal and Xemnas Style Hairstyle by completing objectives.

Each Event Quest contained a powerful boss, referencing Xemnas's position as boss of Organization XIII.

XIII Event - Number 11

 
 

XIII Event - Number 11 focuses on Marluxia and was available from November 13 to 20, 2016 in the English version, and November 13 to 19, 2016 in the Japanese version. Players could obtain the Marluxia B Medal and Marluxia Style Hairstyle by completing objectives.

The Event Quests were filled with flower-like Heartless, referencing Marluxia's control of the Flower element, and the target for each quest was a Wandering Spook, which had a counter over his head, indicating the amount of hits the player could deal before it would use a devastating attack, referencing the fight with Marluxia's Absent Silhouette in Kingdom Hearts II Final Mix.

XIII Event - Number 12

 
 

XIII Event - Number 12 focuses on Larxene and was available from December 13 to 19, 2016 in both the English version and the Japanese version. Players could obtain the Larxene B Medal and Larxene Style Hairstyle by completing objectives.

The quests were filled with either fast moving enemies, referencing Larxene's lightning-fast speed, enemies with little HP, possibly referencing Larxene's ability to split herself into clones in her Absent Silhouette fight in Kingdom Hearts II Final Mix, or enemies that attack with lightning, referencing Larxene's control of the Lightning element.