The Idea Engine (イデア機関, Idea Kikan) is something that originally belonged to Lambda-11, however was transferred somehow to Ragna the Bloodedge after her death in BlazBlue: Continuum Shift. Not much is known at this point except that it is able to bypass the Azure Grimoire's negation. According to Kokonoe, the Idea Engine is a more powerful version of an Artificial Causality Phenomenon Weapon installed in Tager.