2021. Sky
Performing a mission in the sky required many steps, and King Elbas and Noah explored the entirety of Sepunia's memories before starting planning them.
Sadly, the sky wasn't something that the group could predict. Sepunia's memories confirmed that Heaven and Earth could modify their home freely, so part of her knowledge was useless.
The three experts couldn't only move their focus on different aspects of that mission. They couldn't barge inside the sky and hope that everything went well. They had to do their best to keep their invasion a secret, which had to start from inside the stormy regions since Heaven and Earth were already aware of their intentions.