It seemed that Lu Yu easily killed Du Ten's avatar, but in fact, the battle was very dangerous. If Lu Yu hadn't discovered that the Purple Flame Demon Fire could restrain the Poison Mist Giant, he might have been poisoned alive inside the giant.
The combination of the Celestial Qi and Purple Flame Demon Fire is indispensable, along with the ample Spiritual Qi provided by the Eye of the Sea. Otherwise, Lu Yu wouldn't have been able to release such a large amount of Purple Flame Demon Fire.
For someone else, even a Martial Cultivator of low-level Qi Sea Realm, they would have already been trapped and killed inside the Poison Mist Giant.
The poison of the Poison Mist Giant is potent enough to poison Spiritual Qi. Once trapped in the Qi Sea Realm, one cannot absorb Spiritual Qi from the air to restore Spiritual Power, and can only be slowly worn down by the Poison Mist Giant.
