The Shu-Torun war minister was the leader of the War-Faith, the military forces of the Kingdom of Shu-Torun. Hollian was anointed leader of the War-Faith by the king of Shu-Torun, before she was killed, along with the king and Monthan, after an assassination attempt on Darth Vader.
After the remaining member of the family, Trios, was made Queen by Vader, she took on the role of the war minister during the War on Shu-Torun, as she believed that she had to fulfill all of the Shu-Torun royalty's roles or she would not be respected.