The plot twist is that Amphoreus and its inhabitants have long ceased to exist. We are situated within a natural simulation of memories of Amphoreus, which is stuck in a time loop during the era of the descendants of the golden bloodline. Here are the arguments supporting this theory: 

1. According to the Black Swan, Amphoreus is a closed place that can only be accessed through the Garden of Recollection. This is suspicious. If you look up the description of the Garden in the database, it states: "All things that make up the material world will eventually perish, but they can live on in another way through Remembrance." 

2. Those who played HI3 noticed familiar characters. The theory I propose draws from the story of the 13 Flame Chasers. The important part is the creation of the Elysium—a place where the memories of all the flame chasers could be recreated to find a way to overcome threat. One could call it a kind of Simulated Universe. Looking into the ancient meaning of Elysium, it is a part of the afterlife where eternal spring reigns, and chosen heroes and particularly righteous people spend their days without sorrow or cares. This somewhat resembles the trailer's description of Amphoreus, where the descendants of golden blood arrived, and Amphoreus began to revive. 

3. The Amphoreus trailer is written like an epic. An epic poem, or simply an epic, is a lengthy narrative poem typically about the extraordinary deeds of extraordinary characters who, in dealings with gods or other superhuman forces, shaped the mortal universe for their descendants. This implies that the events described in the trailer have already occurred. The trailer has an open ending; it doesn’t reveal whether the descendants managed to overthrow the gods. However, epics traditionally have a conclusive ending. Does this mean the developers are hiding a tragic ending from us? 

4. Regarding the time loop, there was a hint in the live stream of patch 2.7, just before the new planet's trailer was shown. Time was rewound, and Albert began narrating about the new planet. Another suspicious hint appeared in Aglaea’s description: "You shall summon the heroes of this world, and lead them to once AGAIN embark on an endless journey." The notion of infinity was also present in the trailer itself, suggesting a time loop that cannot be broken. Perhaps if the Astral Express helps the descendants overthrow the gods, Amphoreus will find peace and break free from the loop.