In 1348, the plague hit Essen, wiping out nearly half the town's population. Subsequently, a group called the Brothers of the Cross, a secret Templar organization, started traveling through Germany promising protection from the plague. Lukas suspected they were after the Ankh, an ancient artifact said to be located somewhere in central Europe.
In 1350, both the Brothers of the Cross and Lukas Zurbug mysteriously vanished. Lukas had two children with Martina Wagner: Christof Ison and Wolfgang Scholz.
In May 2014, Master Templar Juhani Otso Berg accessed a Data Dump Scanner file detailing Lukas Zurburg's life. This led him to Essen in search of the Ankh. However due to lack of corroborating evidence Berg and Violet da Costa theorized that it might be a hoax spread by the Assassins to get Abstergo Industries to waste its time and resources on a fruitless search.