Just like the Dark Dragon described, this place was nothing more than a fortified prison. The deeper Erin and Angelina proceeded, the more they understood this point. The hanging steel chains and spacious, empty caves weren't just there for show. Piles of white bones appeared along the way. No one knew exactly how many dragons who violated the taboo were imprisoned here until their demise. Not only that, but the farther the duo advanced into the tunnel, they sensed the atmosphere turning colder and brimming with a thicker death aura. It wasn't as chilly as the whistling northern winds, but it startled them even more.