Crepus was a talented winemaker and his former employees, such as Elzer, Adelinde and Connor held great respect for him. He also took in Kaeya as his son after he was abandonded at the winery. When Crepus was young, he dreamed of joining the Knights of Favonius but did not qualify. He wished that his son, Diluc would become the most esteemed of knights, which pushed Diluc to train rigorously and Diluc would eventually become the youngest cavalry captain in the knights' history.
While on the road after leaving a celebraton at Angel's Share tavern, Crepus and Diluc's transport tavern were attacked by Ursa the Drake. Many were killed and before the monster could attack again, Crepus activated his Delusion to protect his son and defeat Ursa. The effects from the Delusion were so great that he was mortally wound and passed away in Diluc's arms shortly after.
