Below it, there were additional hints.
"This time, the graduation assessment for all senior students at the school focuses on cultivating students' actual combat abilities. There are a large number of monster beasts within the Black Dragon Abyss, and only by killing the monster beasts along the way can one reach the Black Dragon Pool."
"Besides the monster beasts, there are also a large number of Fallen Ones within the Black Dragon Abyss; extreme caution is advised."
"The Black Dragon Abyss, being the transformation of a legendary Black Dragon's corpse, still harbors powerful Dragon Might as its guardian. It only allows Professionists below LV69 to enter, so candidates need not worry about encountering peril."
"Furthermore, there are opportunities within the Black Dragon Pool that are tied to the key for advancing to Epic later on. All candidates, please make sure to reach it!"
"Earth Demon Race, monster beasts, Fallen Ones…"