Terzer completed his first competitions in the Alpine Cup of Nordic Combined in 2014. On February 12, 2017, he made his debut in Eisenerz in the Continental Cup . In the Gundersen competition on the normal hill with a subsequent cross-country skiing distance of ten kilometers, he reached 39th place. On January 6, 2018, he achieved his first point placement in Klingenthal as 26th and a few days later, on January 21, 2018, in Rena , Norway, his first victory in this competition series. Terzer took part in the Nordic Junior World Ski Championships 2018 in Kandersteg . He won the silver medal in the sprint competition and the gold medal in the team competition together with Johannes Lamparter , Florian Dagn and Mika Vermeulen . In the second Gundersen competition he came in eighth. On March 4, 2018, he gave the Finnish Lahti its debut in the World Cup . On March 17th he reached 25th place for the first time in Klingenthal points. At the end of the season he finished 66th in the overall World Cup. In the Continental Cup of the 2017/18 season , he achieved 33rd place.