 The additively manufactured CoCIFEMNNI high entropy alloy with laser powder bed fusion, LBPF, under reactive N2 atmosphere exhibits enhanced strength and ductility due to the formation of ordered nitrogen complexes, ONCs, in the octahedral interstitial position of the HEA matrix, resulting in a higher dislocation density with smaller dislocation cells, and an outstanding ductility of 15.3%, with an increment of 34%. This article was authored by Dandan Zhao, Kuan Yang, Do Wei Wang, and others.