Pride was an important matter, especially for magical beasts that had reached the peak of the cultivation journey. That feeling was even more significant for the Eternal Snake due to its angry character.
Still, pride and anger easily led to misconceptions, and they could blind even the wisest existences. The Eternal Snake wasn't part of that group, but the many experiences accumulated in its long life didn't help it understand its flaws.
Remaining loyal to its species was a commendable effort, but it became stupid when it turned into a hindrance toward higher forms of power. The Eternal Snake wasn't willing to accept anyone's help, but Noah's actions had forced it to realize how weak it truly was.
Truth be told, the Eternal Snake was powerful. Only some species of dragons could overcome its innate abilities and sheer physical strength. However, the battlefield had long since gone beyond the mere struggles of the higher plane.