Bleach: Thousand-Year Blood War depicts the final war between the Soul Reapers and the vengeful Quincy empire, starting with the Quincy empire's successful invasion of the Soul Society. Not only did the Soul Reapers lose countless troops, they also suffered a serious emotional blow, terrified that their enemies were much stronger and better prepared than them. No one embodied that terror more than Sternritter F, Äs Nödt.
Source:https://www.cbr.com/bleach-villain-as-nodt-defeated/