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Horacio's Retribution is a recurring Helix Rift Event in Assassin's Creed: Rebellion that originally lasted from April 30–May 6, 2018. It comprises of five missions set in Spain during the Reconquista in which the former-Knight Hospitaller Horacio de Heredia joined the Spanish Brotherhood of Assassins after Tomás de Torquemada ordered the Inquisition to execute his family as heretics.
Successful mission synchronization gives players Data Nodes which unlock various reward tiers based on the total Nodes collected, with the top tier granting players the ability to play Horacio in future missions; a heavy weapon, set of heavy armor, and accessories scaled to one's Brotherhood level; and Codex. Players can earn extra Nodes if they use one or more preset Sync Bonus Heroes.
Official Synopsis
Spain: 15th century
Near the end of the 15th century, Torquemada's madness knew no limits, striking friends and foes alike.
Caught in the middle of the Inquisition atrocities was the virtuous Knight Hospitaller of Rhodes Horacio de Heredia, whose noble family still lived in Spain. When his parents sided with other honorable noble families that refused to support Torquemada's abuse of authority, they were all accused of heresy and executed.
Getting wind of the situation, Horacio abandoned his order to embark on a journey to avenge his bloodline and all those who suffered at the hands of the Inquisition.
As Horacio sets foot back into his motherland and heads to his family estate, the Spanish Assassins decide to approach him...
Memories
Chapter 1 - Old Castile
Chapter 2 - New Castile
Chapter 3 - Fort Alphonso
Reference