Kalmiya was a Smart artificial intelligence construct created by Dr. Catherine Halsey. She served as a host for prototype routines to test the software intrusion routines and software that would later be integrated into the specialized AI, Cortana. In a sense, Kalmiya was Cortana's older "sister." Kalmiya resided in Halsey's office in ONI's CASTLE Base. She was left there with Dr. Halsey during the Fall of Reach and proved very useful in helping Halsey and her SPARTAN-IIs escape the facility.