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Larger updates are called Expansions and not kept within the standard numbering scheme. The [[Legacy of Romulus]]
and [[Agents of Yesterday]] expansions introduced a new playable [[faction]], while [[Delta Rising]] was focused on endgame.
Season 15 to Season 17 were termed an "expansion-over-time" by the developers, indicating the equivalent of expansion-level content focusing on [[Star Trek: Discovery]] spread over 3 seasons rather than as a single release.