Simply put, this was a precious Gemstone. If it found the right buyer, it could be very valuable. But how many people would recognize its worth? After all, it was so rare. Things are valued for their rarity, but if something is too rare, it loses significance.
As for its role in the Dream Realm...
Alka directly crushed the Gemstone. Twisted light and shadow began to surge forth as it shattered.
Pink mist gushed from Alka's palm, capturing this twisted light and shadow.
Then Alka retreated into his own dream, pulling this light and shadow into his Dream World.
In his dream, Alka waved his hand, and a transparent Gemstone materialized in the center of the Dream World.
He stuffed the captured twisted light and shadow into it.
Dots of Starlight appeared within the transparent Gemstone. This was a type of Energy unique to the Dream Realm.
Only after Alka had defeated the monster and truly used the Dream Catcher did he gain more information.
This Energy had many uses.