When Rowan awakened these Angels and gave them eyes, he had drawn them from the darkness, and the flames that prevented their resurrection and made them his own.
The eternal Intent that kept them chained was being slowly cleansed by his Primordial Bloodline, and he would never have understood the root of it all in time if he had not unearthed the portion of the truths from the Golden Book.
Another mystery about his bloodlines had been peeled away, and Rowan was eager to understand more, nevertheless, he proceeded to create the Empyrean Alloys using materials harvested from the planets.
Not Emphrean Alloys, it should be called an Abyssal Alloy, because his Primordial Sea of Darkness did not originate from an Angelic root, but a Demonic one.