Wu Yu had now put aside his Unshackled Doppelganger, advanced dao treasure, and the puppets of the Floating Dreams Pagoda. His focus was solely on the Heaven Devouring Avatar. 

He often gave his Unshackled Doppelgangers Great Dao Primordial Spirit Pills to use and therefore this process wouldn't draw the attention of others. 

When his Heaven Devouring Avatar saw a Great Dao Primordial Spirit Pill, he didn't seem to feel the desire to consume it. 

From this, Wu Yu concluded that perhaps immortal medicines wouldn't do the trick. 

He took out some immortal essences of various types for the Heaven Devouring Avatar next. In the end, immortal medicines and immortal essences didn't seem to be what the Heaven Devouring Avatar wanted. 

Nonetheless, he still gave it a try. In the end, he realized that his Heaven Devouring Avatar couldn't digest immortal medicines or immortal essences. 

The core of the Heaven Devouring Avatar was a ball of mist. Therefore, he could retrieve those immortal medicine and immortal essences by reaching into his new body and pulling them out. 

There was a possibility that it was because his Heaven Devouring Avatar was...