Sunny stared at the runes, perplexed.
Then, a sudden light of understanding appeared in his eyes. He finally realized what was the principal difference between an Echo and a Shadow.
It was really very simple.
The Echoes were mere replicas of the creatures that had left them behind. They were molded in their image and never changed, always remaining the same as the originals at the moment of their deaths.
Shadows, however, were different. After all, they were mercurial by nature, always changing their forms and shapes depending on the environment. And so, a Shadow was capable of change to some extent, too.
It was capable of growth.
His eyes widened.
By slaying Nightmare Creatures, he was able to absorb their shadow fragments and become stronger. Eventually, his Shadow Core was bound to evolve, turning from Dormant to Awakened… and beyond. The jump in power that came with this evolution was nothing short of unmatched.