Tang Wulin and Gu Yuena's perception of his bloodline was the strongest. After all, they originally came from the Dragon God. They did not wait, nor did they have any illusions, because once Lan Xuanyu acted, it would inevitably become an irreversible situation. Hence, they flew out, heading toward Lan Xuanyu.
Back when Lan Xuanyu embarked on the path of becoming the Dragon God, the couple had already decided that if their son encountered any problem in the process of achieving this, they would rather sacrifice themselves to complete his achievement.
The Dragon God's death back in the day was not a true death. Part of the power attached to the Dragon God's Core and the Dragon God's Skeleton established the Dragon Realm, creating the Dragon God's graveyard for the dead Dragon Clan. This allowed the Dragon Clan's aura to be preserved, preparing for future revival.