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Among these sorceries and divine abilities, Xu Fan could have easily cast any one of them to turn the Ghost King Tiger into dust, completely obliterating it.
However, Xu Fan had a different plan in mind, thinking it would be better to use such an excellent killing machine for himself rather than destroy it.
Such an idea emerged due to the fluctuations of the Four Symbols Creation Flag; upon probing with his Divine Sense, Xu Fan sensed a greedy craving from the flag towards the battle soul of the Ghost King Tiger.
What did this mean?
It meant the battle soul of the Ghost King Tiger was of use to the Four Symbols Creation Flag.
Following this train of thought, Xu Fan guessed that he had yet to understand the true purpose of the flag, but now he finally got a clue - the flag had probably not been activated yet.
To activate it, it seemed that he would need to gather the souls of the four Holy Beasts.