After climbing up, the system will teach us assassination techniques, which are effective against less alert enemies. Simply approach from behind and press E.
You can also perform an assassination by quickly moving across from the left wall to the opposite side.
Continue forward. On the right side of the platform ahead, there are stairs leading down to a save point below.
The main purpose of coming down here is to explore the map and allocate skill points. There's no need to enter the "Secret Realm" on the left, as the monsters inside are far beyond our current level and cannot be defeated.
However, entering inside will trigger the "Three-Faced Chaos" quest.
