C509 To use the brain

"Open it!"

Nangong Shi and Lv Fengtian shouted with all they had and used all their strength, but the metal plates were completely unmoving.

The two fellows were so tired that they were gasping for breath. They circled around the iron medallion a few times, but didn't find anything when they knocked on the roots.

"I can't move!"

The two fellows shook their heads in disappointment