In the Misty Forest, each super-level magic beast has its territory, which is essentially fixed and not easily relocated.
This made it convenient for Gu Yang. He went door-to-door, casting an illusion followed by a hammer blow to kill any beast with a lower realm than him.
If he encountered beasts with a higher realm, he would summon his divine beast avatars to gang up on them, while he wielded the Human Emperor sword. No super-level magic beast could withstand it.
Of course, he did not obliterate super-level magic beasts that had friendly relationships with elves, such as unicorns. He invited them to join the Elven family, for togetherness offered warmth.
The super-level beasts in the Misty Forest were formidable. For many years, the Elf Clan and these beasts lived like water and wells, not easily provoking each other.