The Sect of Ten Thousand Beasts is named so for two reasons. The first is that the cultivation techniques and spells they practice are derived from ten thousand beasts.
The second reason is that they possess various beast-taming skills and can control strange beasts.
However, the strange beasts they control must not exceed their own strength. If the beasts are too powerful, they will not be able to control them.
The Lion Beast Demon exists at the peak of the Immortal Realm, while his strange beast is at the early stage of the Immortal Realm.
In usual circumstances, his strange beast doesn't help him much.
Originally, his strange beast, although weaker, was not that much weaker. But upon reaching the Immortal Realm, things changed.
After the Immortal Realm, strange beasts can comprehend domains, and Xu Ying comprehended it. Clearly, his strange beast's comprehension is far inferior.
