Event Chain
Event Chain (empire) in the Stellaris encyclopedia: Event Chains are interconnected sequences of events that unfold over time, often triggered by exploration, Anomalies, or empire decisions.
Event Chain in the game's words
The encyclopedia entry as the game shows it in its tooltips; underlined words open their own entry or page here.
Event Chains are interconnected sequences of events that unfold over time, often triggered by exploration, 
Anomalies, or empire decisions.
Event chains may involve scientific discoveries, political intrigue, or galactic mysteries, sometimes leading to powerful rewards or dangerous threats. Careful decision-making is essential, as individual choices can have a lasting impact on an empire's future. Chains are listed in the Situation Log tab of the 
Situation Log View.
Entries that mention Event Chain
More in Empire
Source: common/game_concepts (concept_event_chain, also concept_event_chains) and localisation/english, Stellaris Cygnus v4.5.2 (9776).