"Is the lock this key corresponds to here? In other words, is the Heart of the Earth here?"
Shade guessed, but there was no keyhole on the door, so the key was useless. However, there were four hexagonal indentations on the door, which seemed meant for placing stones or gemstones.
"Four stone keys? Why is it always this kind of mechanism?"
Shade muttered.
Would you prefer five keys?
"No, no, four is better."
He temporarily set Mia on the ground, then rolled up his sleeves and pressed his outstretched hand against the door:
"Turn Stone to Mud!"
The stone beneath his palm indeed turned to mud, and Shade swiftly reached his hand into the stone door. But in the next instant, tremendous force surged from the door. Completely unprepared, Shade was sent flying. He flew five or six meters before crashing onto the ground, then rolled several times before finally stopping.
"Oh, that really packs a punch~"
"Meow!"
The cat trotted over to Shade's side. Seeing him prop himself up with his mud-covered right hand, she took another step back and did not come closer.
"I knew it wouldn't be that simple."
He picked up the cat with his clean left hand and placed her on his shoulder.
"The keys for Butterfly and Earth here probably still have to be found through the Granger Family."
You think this is—
"Mr. Lehmann's tomb. Most likely, it's here."
Shade did not look at the stone door again. Instead, he summoned his Destiny Ring and let the glow of the Spacetime Spirit Rune illuminate the wall. Sure enough, the smooth wall to the left of the stone door gradually vanished under that light, revealing a Hidden Passage. Shade sighed in relief. This meant that today's journey had yielded something after all.
"At least