The Rampage Across the Heavens is the fiercest war of the gods that the eastern continent has every faced. The gods split into two factions that were led by the Corrupted Huang Long and the Divine Beast Sun Wukong. This war made the current eastern continent to what it is today as numerous gods died in that battle.
The gods that died have created numerous demon beasts from their destroyed divine bodies. One could even say that the demon beasts in the eastern continent are all descendants of the gods that have perished in the Rampage Across the Heavens. It is also the reason why the demon beasts have abilities and the capacity to cultivate just like the humans. They have the spark in them to become gods as well if the barrier that restricts the eastern continent breaks.
