Only the dragonkin know the process to create true dragon armour. Others can perhaps manipulate the base metal, orikalkum, but they lack something in the process that turns the metal into true dragon metal, a far stronger source. In aeons past, on their original world, dragon armour was worn by the Ortius Chen, the mighty warriors of what was once a great dragonkin army.
No ledger records the outcome of the battle, for what would be the point? Though, dear reader, let me enlighten you – the rebels won. The slaves were freed and across the entirety of creation came a great song of freedom.
A song so loud that it woke the sleeping Elder Gods, and their dread work began.
The rebels did not make it to this universe, they stayed behind to defend their wards from the Great Revision. In their last moments, they fought back against the creators of the universe, in the hope that it might save those they had learned to call friends.
They failed, and the dragonkin that grace this reality do not mourn their absence.