At its height the Pesenese Union, centred around the Hromo brane, consisted of two dozen species and claimed territory in Dúta, Wúntlo, Gavhe, and Pzúghamë. At that time it was the most powerful political entity in the Expanse other than the Tletkettoyi, and most likely the first state with such an extensive domain.

The Khúsak introduced the concept of democracy to the Peseneyi in 3806 ksepo, causing the secession of all alien worlds from the Union within ten months, all of which would be conquered by the Ksreskézai some thousand years later.