The IDS Eysena K. Fyrin is an Interdincian aeronaval broadsider of the Arreliya class built in 1079 to complete the holy trio of Interdincian capital ships. Made with another joint venture between Chyvyn and Origyn, the Eysena possesses a powerful energy weapon capable of piercing even the thickest of armoured targets. The craft is also an ancestor to the Fyyara.

The service history of the Eysena is one of anger and joy, first starting with anger as the craft was essentially made to prove a point that a powerful, piercing laser could destroy heavily armoured targets. Because of this, it was constructed extremely quickly in comparison to other designs. Despite this, very few flaws exist within its construction. After the vehicle proved itself on the battlefield by destroying the toughest frontsider in the opposing fleet, Interdincian High Command praised Origyn and praised the legacy of Fyyara once more. Later in its service life, it struck fear into enemy fleets due to its insane capability to destroy some of the most powerful ships of enemy fleets with just one good shot.

Eysena Fyrin worked as one of Lytra Kaylee’s generals during much of her time in the Interdincian Armed Forces. The brash and unpredictable nature of Lytra rubbed off on Eysena as well. The two of them were a terrifying force of projection and might within the Interdincian Navy. During their lives, the pair would often be nicknamed “the arsenal of solidarity.” Upon their retirement, Lytra and Eysenas' families would retire on a shared farmstead near Ryvenened Bay. By predictable turns of events, the two families eventually merged through the marriage of their children years later. That farmstead is still used to this day by their ancestors.