'A supreme wave crystal!'
The crystal with nebula energy was a unique wave crystal type that was incredibly hard to obtain and worth more than an Adamantine Artifact. Its energy was not only exponentially purer than that obtained from high-quality wave crystals, but it also refined your energy pool.
Supreme wave crystals were the cores of some mines that generated wave crystals, and their origin was said to be out of this world, some speculating that they fell from the Astral Sea into Aether.
Cain was amazed to see someone like Ina having one since they were treasures even some Divine Ascension Masters did not have.
'She must have had a powerful background.'
Ina's death would enrage very powerful people, but Cain could not care less about it, and after finishing with Ina's space ring, he focused on the last one that belonged to Sabina.