This article is undergoing writing.
After the events of index, Cassandra receives a distress message from Elysia, warning her about a potential invasion of the Iedena Universe by the Hubble Universe.
Not too long after (~2-3 years), Cassandra assembles the Raven Organization to leave the ArcNyx universe for the first time to fly towards the Iedena Universe, which was starting to get invaded.
Upon reaching the universe, the RO was attacked by Iedena’s forces, thinking that Hubble called for backup.
Cassandra intervened.
Elysia, clearly upset, confronted Cassandra as to why she invaded her universe. Apparently, Hubble’s forces mimicked the RO to a tea (due to extensive intelligence collection from their trading routes), posing as RO to attack Iedena.