The effects of Noah's flames were devastating for the weaker creatures. His innate ability surpassed the level of power of normal middle tier creatures even without the help of his ambition.
Noah had fused two different organs into one. That didn't only add another feature to his flames. It also empowered them.
The fusion didn't double the flames' power since the Eternal Snake's glands weren't as strong as his lungs. However, the many precious metals and the wills he had used during the procedure raised his final product's overall level by a lot.
His lungs were an inscribed weapon now. It was only normal for their power to go beyond their structural limits. The wills that Noah had forged together with the other material made them surpass what a simple fusion could produce.