In the depths of the ruins, they found a Teleportation Portal, and after some analysis of the information in their hands, they discovered that it was the passage connecting to the Sky Castle that was controlled by the Immortal King.
The Immortal King's name was rather frightening. Even though he had disappeared countless years ago, the mere mention of things related to him would make everyone tense up and feel extremely cautious. Everyone knew that the Sky Castles were what the High Elves relied on to rule Anril for ages.
The Immortal King and the Sky Castle certainly meant a massive amount of wealth that was beyond imagination. However, the risks involved were definitely not to be belittled. That was precisely the reason that the team from the Brilliance Shrine and that of Rotterdam reached a consensus to cooperate and explore the Sky Castle.