Xu Nian did not expect this Tiande Sect Master to be so severely injured.
To leave such a Heavenly Dao scar, it's clear that this Tiande Sect Master was wounded by a powerful Immortal Artifact.
And the opponent must definitely be a cultivator above the Early Stage Earth Immortal Great Success.
Otherwise, they wouldn't be able to exert the true power of this Immortal Artifact.
A person who has fully transformed their Immortal Essence can activate an Immortal Artifact and then perform Domain Level Profound Argumentation, which can form a Heavenly Dao scar, and this kind of scar is difficult for anyone to heal unless their Immortal Body is completed.
Even though this Tiande Sect Master is not far from Immortal Body Completion, he is still severely injured.
Of course, it's also fortunate that his Immortal Body is mostly refined, otherwise, he would've been unable to withstand this scar and would've died long ago.