EC Reactor (ECリアクター EC Riakutā) or Eclipse Reactor (エクリプスリアクター Ekuripusu Riakutā), commonly shortened as Reactor (sometimes rubied as "react catalyst" (
Reacting (リアクティング Riakutingu) is the stage when Eclipse Drivers and their Reactors react to each other's proximity, similar to how inflammable materials start to burn when near a fire. Apparently, even regular mages can react to a Reactor's presence, such as when Thoma and Lily first meet each other: Thoma's pupil and head ache when compressed information flows to his brain directly through his retina.
Reactors usually take the form of tiny inorganic items, e.g. knife.
Some Reactors are built inside the Dividers. They React through blood authentication on Dividers.
- Main article: Strosek
Strosek, a.k.a. React Plug (リアクトプラグ Riakuto Puragu), is the rare series of Reactor that possess a humanoid form.