Wandenreich (Blankslate)

is a militarized organization of Quincy led by Yhwach. It's primary purpose is to conquer Soul Society for the use of the Quincy race, which involved the attempted destruction of both the Gotei 13's Alliance group, and the Inner Circle.

History
This Wandenreich appears to have been in the works for at least a century, though it has never been officially named in this universe. Yhwach had remained within the darkness of Schatten ever since his defeat by Shigekuni Yamamoto nearly 1'300 years prior to the Bleach: The War of Four. A century before the war began, he was, at some point, awoken by Sōsuke Aizen, who shared a similar goal with the Quincy King. Together they spent the next several decades searching for surviving Quincy to recruit into their destructive cause. These Quincy would be called "The Sternritter".