SSS-Rank Template! Becoming The Primordial Dragon As A Side Character

He did everything he could to save his world from destruction.
He fought, he bled, and he sacrificed, but in the end, he lost everything.
The gods, the very beings humanity believed were their protectors, turned out to be the architects of their doom.
Betrayed and defeated, he met his end at the hands of the Goddess of Death herself.
When he opened his eyes again, he found himself reincarnated into his favorite novel, not as the hero, but as a side character—a member of one of the world’s most powerful families.
A family renowned for their strength and influence, yet he was born talentless, destined to be doomed

Or so he thought.

Until…

[Ding! Template System Activated.]
[Congratulations! You have obtained an SSS-Level Template.]
[Template Name: Primordial Dragon.]
[The Template Has Awakened.]
[Ding! You have obtained the Primordial Bloodline.]
[Ding! You have obtained the Heart of the Dragon.]
[Ding ...]