Niels Möller was born on Coruscant on 33 BBY. He and his friend Sander Hartog trained their Force powers and lightsaber skills on their own during the Clone Wars (19 BBY-2 BBY) He has never known his parents since he was adopted by the Hartog family. That was how he and Sander became such a good friends. During the trainings under the command of Jedi Master Yoda he developed extremous Force powers. When the Clone Wars started he was sent away on many missions, and had the command over many troops during battles.