It's The Extreme Yin Body

When Shen Fei saw the Yellow-haired Wild Boar's reaction, he could not help but let out a long sigh of relief.

Although the Flame Owl could indeed kill the Yellow-haired Wild Boar, it would take some time, during which Shen Fei could not guarantee that the Yellow-haired Wild Boar would not try to turn the tide and go after him, the Beastmaster.

After all, he had the Flame Owl in his command. He also dictated when the Flame Owl would eat... If the Flame Owl ate the boar, it would be a problem.

Shen Fei was not a fool. He chose to keep the Flame Owl back to the pocket realm to avoid a crisis. But now, it seemed that this was a wise decision.

However, he was still a little worried about the Yellow-haired Wild Boar. What if this fellow broke through its rank? 

But it was obvious that this was impossible. The existence of the Flame Owl was like a mountain, pressing down on the wild boar, making it unable to move at all.