@ArisenMoon Glad you joined us
A few edits are needed:
Firstly it is very unlikely that Deliverance (a small island) has a city let alone several. Bear in mind Formaroth is a continent and it only has 5 cities. Giving the setting most people would live in hamlets, villages and towns. The capital of Deliverance would most likely be a castle with a town surrounding it or something similar.
Going by the lore it is more likely that Antherion was defeated and banished by the Remomnnets (original rulers of Formaroth) after they finished conquering Formaroth (note this happened 500 years ago)
Claim to the Throne: House Antherion has ties to royal blood from their founder, Prince Antherion the Forsaken. They see their lineage as one of the few pure blood lines left, however over the years, this drive to see their descendants on the throne has diminished. Now, more and more, House Antherion has turned to their roots as pirates and raiders.
This is fine as it's not to far fetched to believe Antherion was related to the Remomnnets, but you should know that most people won't see it as a valid claim in Formaroth as they view the bloodline to be sullied.
Also here is an idea: Formaroth is mostly protected from pirate attacks from the east by the kingdom of Akki. As a result House Antherion would likely raid the Elven Imperium and Seikatsu. This could also be another reason why there is a lack of trade between The Imperium and Formaroth due to the fact there is a high risk they will be raid by house Antherion.
@Fallenreaper You could make a mention to this in your intro post.
Now that war has broken out and House Neptuna (rulers of Akki) have sided with the alliance House Antherion will be able to raid Formaroth again, should they wish.