Thules

Thule refers to a subfaction of Nazi who practice occult arts, specifically the dark arts and experiments involving the dead. They have worked on the secrets of necromancy and have been engaged in a secret war against the Initiative, a group of rabbis.

History
During World War II, some of the Nazis became interested and involved with the dark arts. They were particularly interested in reanimating the dead. They experimented on people they killed or prisoners of war, such as the jews. Eventually, the Thules managed to complete their goal and reanimated dead members of their group. All of their experiments and the results were recorded into a ledger, which they kept secret.

Their activities eventually caught the attention of a group of rabbis called the Initiative, who then waged a secret war against the Thules. The rabbis sent a golem to storm the encampment of the Thules to great effect, although the ledger was lost for many years and will not resurface until 2013. The leader of the Thules also managed to escape by performing a ritual a few minutes before the golem attacked him.

Season 8
In the present, the Thules, including the reanimated memebers, began to look for the ledger which they lost.