From BZPB Wiki

The Reckoning is the final war for all creation between Blackout and F-Klak. The Architect's Zerstörung durch Fortschritte der Technologie tells the story of it and the events that led up to it (i.e: the whole of BZPB)

The ZFT organization's stated goal is to prepare for the Reckoning.

The Reckoning was altered once F-Klak died at Ragnarok. Now, the remainder of F-Klak's empire, and pockets of resistance are all that remain to stand against F-Blackout.