Serina is an artificial intelligence created by the UNSC to help fight their interstellar war with the Covenant. She is the shipboard AI of the UNSC Spirit of Fire, the ship featured in Halo Wars. Similar to Cortana, Serina is projected as a hologram with a blue hue, although Serina chooses to depict her avatar as wearing clothes, unlike Cortana. Serina serves much as the campaign advisor in Halo Wars, often appearing to pass along information or an objective. She also appears in the CG cutscenes and plays a small role in the story. After the Spirit of Fire left the Forerunner Shield World, Serina was left in charge of monitoring the ship while the rest of the crew entered cryo-sleep for the long journey back home.