The Catalyst, also known as the Intelligence, is an ancient artificial intelligence that resides within the Citadel. Original created as a maintainer for the various minds that's in the Citadel, those of being the Zelius. the Catalyst was rewriting two times over it's lifespan in the Riz'ro, Tiz'ro, Piz'ro and Kiz'ro Universes, first was the Leviathans then the Reapers. Before being encountered by the Shepards, the Catalyst was believed to be the final component necessary  the Crucible, and was mistakenly thought to be the Citadel itself.

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