Event Interference

Phenomenon Intervention (事象干渉) is an ability primarily possessed by Observers. It allows them to Observe a phenomena or existence and predicate an individual's own existence. Phenomenon Intervention allows one to also re-write discreet pieces of a target's past actions in order to help influence the reality of the present time. Phenomenon Intervention can actually be undone by the Manifestation Demolition Blade: Kusanagi.

If it cannot be determined if an individual actually “exists” or not, performing a Phenomenon Intervention becomes extremely difficult, if not impossible.

Takamagahara used an extortionate amount of Phenomenon Intervention during the Continuum Shift, using the scattershot event to pick-and-choose which timeline they favored when getting closer to the Azure; this stopped when Hades Izanami seized control over the AIs.