Thunder Tiger

Of course, the Fierce Ghost Army and Hidden Dragon Army still had vast numbers of Golden Core-level fighters. But after being tempered by war and working hard at cultivation, even the weakest among them had now reached at least the Golden Core High-tier. The Fierce Ghost Army had especially many Golden Core High-tier ghost generals, making up the vast majority. The rest were either Golden Core High-tier or Golden Core Peak.

For now, Lei Dong no longer had enough resources to help them advance.

Lei Dong took stock of the forces at his disposal. First, after all the fierce fighting, only 4,500 members of the Hidden Dragon Army were still alive. Their survival rate was so high thanks to Lei Dong's rotation tactics: whenever someone was wounded, they immediately entered the Cave Heaven Blessed Land to recover and cultivate. Once healed, they went back out to relieve their comrades on the front lines.

As a result, unless someone was killed on the spot, most could be saved. Some had even broken through on their own after brushing with death. With no abundant resources available, Lei Dong had no choice but to let them advance on their own inside the Cave Heaven Blessed Land.

Fortunately, there was still a year left—equivalent to ten years inside the Cave Heaven Blessed Land. Some might get lucky and push from Golden Core Peak into the Nascent Soul level.

Then Lei Dong had a thought. Since the air here was saturated with pure Chaos Spirit Qi, why not try exchanging the atmosphere with the air inside the Cave Heaven Blessed Land? After experimenting with a few formations, he quickly mastered the technique.

By keeping the connecting passage open for long periods, Lei Dong used two simple formations to continuously draw air from the Chaos Otherworld