This old dragon had lived for who knew how many years and had seen a great deal. Later, he proved quite useful to Lu Xiaotian.
After Lu Xiaotian was lured into the Sky-Shadow Clan's secret realm and fought the clan, the three Fulong Sages controlled by the old dragon had been responsible for stirring up chaos within the secret realm.
Later, when Chen Fufeng and Warden Bai Tai joined forces to wage war in the Sky-Shadow Clan's secret realm, Lu Xiaotian had sent him out as well. Using his identity as one of the three Fulong Sages, he had tried to infiltrate the enemy's ranks. Though he hadn't achieved the desired effect, he had at least been of some use.
The old dragon had thought Lu Xiaotian had no hope of standing against the Immortal Realm, and he was unwilling to remain beneath Lu Xiaotian, so he had struck out on his own.
It looked as though the old dragon had grown stronger after leaving, recovering to the Dragon Lord Realm. Lu Xiaotian simply hadn't expected the fellow to join forces with the Immortal Realm. Perhaps becoming a Foul Celestial Dragon had been what attracted him.
To the old dragon, becoming a Celestial Dragon meant reaching the pinnacle of power. Such temptation was naturally hard to resist, especially with benefits like the dragon clan's totem on offer.
Any Celestial Dragon was a great calamity for the Immortal Realm, but nothing posed a greater threat to it than a Supreme Heavenly Dragon.
If they could use the Foul Celestial Dragon to break through Lu Xiaotian's arrangements in the Dragon Domain, it was worth paying a small price.
In theory, even the four Heavenly Emperors working together couldn't defeat Lu Xiaotian now. Only two Heavenly Emperors had come for the Puppet Emperor's