Some articles on haschwalth:

Bountos - Non-Soul Reapers - Vandenreich - Haschwalth
... Haschwalth (ハッシュヴァルト, Hasshuvaruto?) is Yhwach's right-hand man and is seemingly in charge of the Stern Ritter ... Later Haschwalth and the Stern Ritter went with Yhwach to destroy the Soul Society ... After Yamamoto's death, Haschwalth is told to convey to the other Stern Ritter that they were to raze Soul Society before Ichigo arrived ...