So, I reached the point where the Drukhari Travisten removed the maggot. The Bug that occured during this procedure unfortunately broke the game.

It removed any statuseffect currently afflicting my party, like Traumas / Injuries but also every permanet Buff that was active. So things like Emperors Voice or Witch Collector also dissapeared. They still show up in the caracter shee (Features---Talents) but dont give their boni anymore