Ierot Aurelius was a wizard once. A human mage who was part of a cabal of similar explorers into the universe's mysteries. At some point, as age became a concern to them, they decided to find some means of immortality.
Using their knowledge of alchemy and biological sciences, they crafted new bodies for themselves based on rendered flesh and bone of numerous dragons that they had captured. Transferring themselves into their new vessels, they became immortal draconic humanoids, and their adventures through the multiverse continue to this day.
Ierot is largely aloof, only meeting up with the cabal occasionally. Mostly he wanders on his own, exploring the multiverse.