Ilben

Ilben, (pronounced/) a dwarven man who gave the party a warm welcome to Dexicos that was welcomed after facing patrols and wanted posters for Leoven. Unfortunately unknown to the party at the time Ilben was plotting against the group and specifically Leoven.
They are the highest member of The Twelve after the death of Aspida, they created and engineered many of the plots against Leoven, including the recruitment of Khantos Evergreen into the plan. Using a totem he started mounting psychological warfare upon members of the Vallotis and Leoven herself. He then sours this alliance with Khantos when he starts to ask for certain freedoms with access to the automatons they are producing, when Khantos refuses to back down he makes it clear he would have him killed if he continues to be disrespectful. 
Later after the group becomes aware of The Twelves existence, the party try and gather some intel on Ilben in order to confront him. They learn that he is extremely skilled at manufacturing traps and to be wary of it. They also find out that Vash was hired by him to kill his own wife he assumes as she was starting to show disloyalty to the cult. He also makes it clear that Ilben was able to find him when he was carrying out the murder and his begrudging fear and respect for such a feat and such cruelty. The group then never confronts Ilben directly.
The party witness him at the rite that brought Hyperion back to the material and during this ritual he is knocked unconscious. After the defeat of Hyperion he was arrested and sentenced to death. The group did not watch his execution be carried out though are informed by Lycas that it was successful, so he is assumedly dead.
His daughter is put into child protective services where she will hopefully grow to learn of what her father was truly like and the cruelty he exacted.