Gorns spoke in a weak voice.
He had been bound by these thousands of sealing chains for nearly forty thousand years and was very aware of their toughness. Even at his peak strength, he would have been unable to break free.
Although the Warlord was one of the two most powerful figures in the entire Nightmare Legion, in his view, Sterl had only just broken the seal, and his strength was barely a fraction of what it once was. He couldn't possibly break through the Abyssal Prison seal created by the Eternal Light World.
Rather than wasting energy to free him, it would be better to preserve strength and find a way to escape Abyssal Prison. To him, the safety of the War Demon was more important than his own life.
Sterl didn't heed Gorns' advice. These sealing chains were indeed unbreakable, but they were only meant to hold powers weaker than gods.
With his own strength, he knew at least two ways to break the chains.