The Arediāni people were, and still are, adept navigators, ship builders and insatiable explorers. Who place a lot of importance in their communities, families and friends to maintain their mana and link to Alakani. Which is why the context of the Second Landing of Uru was a formative and traumatic experience for the people of the Moana Arediāna. The islands were administered directly by the local Ari'i (Lords), however, the Priests of Uru were the defacto power among all of the islands and even projected their influence in Northern Charsta. This Theocratic regime was made formal by the fall of the Apian Empire, and it's power was not to be underestimated. The Theocracy of Uru, which is also referred erroneously to as the Kingdom of Alakani, had oversaw and maintained strict social restrictions upon all of Arediāni society by a Reoatua which translates to roughly as the Voice of the Gods. These stringent social rules, practices, combined with the religion of Alakani was referred to as Tapu. We know that the theocratic structure was useful in maintaining a hierarchy of explorers, navigators and rulers who were seen to have the mana to be given the privileged of their role, as many post cicloist historians have written about and many may be tempted to leave it at that. However, there is also precedent that these rules were made due to the challenges unique to an island environment, a major one being the lack of space and thusly food potential. Population sizes had to be very carefully managed, livestock as well, or else they would risk ecological disaster. Other beliefs and rules varied depending on the environment on an island and it's size.
This Tapu system was inconsistent from island to island , the farther away from Uru's influence, the greater variation there were in these rules. Something that Reoatua Hionahīmene thought needed to be fixed in order to maintain their peoples connection to the Gods. They met with Ari'i of different islands who aligned closely to the Theocracy to take over their local islands, supporting them using Uru's and Hananui's safe ports and food potential. The campaign was a long and arduous one for some islands to bring to heel, while others didn't put any fight at all. However, this did not solve the issue of people refusing to follow the new rules of the priest, and a crisis to the power of the priests needed to be averted as commoners began to rise up against the rulers Hionahīmene put in place. They instead chose to use exile as a punishment, many Arediāni people to up to the southern Illaguan coast as Arenia proved unpalatable to many. But those who did move to Arenia, moved to Rio Avan. Even with solving the immediate crisis using exile, the Priests would quietly start to fall out of favor with those who stayed, resentful of what happened to their friends, family and neighbors.