- "All this damage from four planes?! How is this possible?!"
- ― Hrimfaxi crew member
The Hrimfaxi (リムファクシ Rimufakushi) was the second Scinfaxi-class nuclear submarine developed by the Union of Yuktobanian Republics during the Cold War. It along with its sister ship, the Scinfaxi, was later destroyed during the Circum-Pacific War.
The Hrimfaxi's creation was announced at the unveiling of the Scinfaxi in early September 1991. The Hrimfaxi entered service with the Yuktobanian Navy in 1997, 2 years after the completion of its sister ship; however, the vessel's battle record prior to the Circum-Pacific War in late 2010 remains unknown.
A little more than a month after the sinking of its sister ship, the Hrimfaxi began launching burst missiles at Osean ground forces from several hundred miles away in the Razgriz Straits. On November 14, the Hrimfaxi temporarily ceased its missile launch operations, surfaced, and began refueling from a friendly tanker; a defensive line of picket submarines was established around the submersible to warn of any hostile forces.
The Hrimfaxi received an alert from one of its scout subs that Osean fighters were inbound. The Hrimfaxi aborted the refueling effort and began emergency diving preparations; however, before it could successfully submerge and escape, the Osean fighters damaged its ballast tanks, making sustained submersion impossible. Unable to run, the Hrimfaxi engaged Wardog with its anti-aircraft weaponry, burst-missile barrages, and swarms of vertically-launched UCAVs. Eventually, the Hrimfaxi lost its defensive weaponry and the ability to dive altogether; after sustaining considerable hull damage, the vessel was torn apart by a reactor overload, similar to the fate of its sister ship.
- The names of the Hrimfaxi and its sister ship, the Scinfaxi, are taken from Norse mythology: Skinfaxi and Hrímfaxi are the supernatural horses of Dagr (god of day) and Nótt (goddess of night), respectively.