Deriving

Sister Orb analyzed the piece of stone in the Dimensional Realm as the twins moved deeper into the ruins, following the resonance with their own fragment. [This is definitely the right place. The ruins were made with Clenhest Stone, not something you two can hope to damage at the moment. It's very difficult to work with, but it's definitely a great material to use when the goal is to defend a facility.]

Rean took another one of the stones on the ground and muttered, "I wonder if I could use it to make equipment."

[Not a very good idea.] Sister Orb replied. [By the time you get the necessary skill and strength to manipulate it, there will be much better materials to work with in terms of forging equipment. Besides, it affects one's ability to fly when you get close.]

"I see..." Rean understood. He then looked at a small wall that fell near him for a moment. "Too bad..."

Roan was more interested in the mission, though. "How deep is the fragment?"