The Dreamwalkers
There was the Great Tadgh, who created the gods, who, in turn, created the Dreamwalkers. These Dreamwalkers were inhuman, and, true to their name, inhabited the realm of dreams and abstractions. They are somewhat akin to muses, but were much more. Not gods nor deities, but the very ideas themselves. They were dreams.
They were able to speak to the gods directly, and with humans and gods alike through dreams. This also granted them influence, as all are susceptible to a soft whisper as they rest. Aside from the Great Tadgh, they were the only ones who seemed to have omnipotence and omnipresence.
Naturally, that is a very threatening scenario.
At the same time, were you a Temptation, it is a very opportune scenario. Leucine, the Second, sought out godlike powers through felling Alain, however, no doubt that she too first attempted to usurp the gods along with her sisters by hunting the Dreamwalkers. Despite being the very embodiment of an idea, Dreamwalkers tended to have forms that resembled humans. It make traversing the realm of dreams easier, and comforted the humans more.
The Temptations, in all their vanity and power lust, attempted to capture the Dreamwalkers, for if they were able to control dreams, they could nestle ideas into the gods’ minds much more easily.
Be it as it may, the Dreamwalkers, having become aware of this plot, fled their real and entered the human realm. Once outside the safety of their realm, however, they would not survive for long, so the Dreamwalkers each seized a human, entered their minds, and transformed them into a vessel.
And thus, the Inathid were born, Inathid being the self-given name of their people.
It goes that the Inathid were retained the knowledge and powers of the Dreamwalkers, but as time went on and they become more and more human, those powers dwindled to nothing. But the knowledge? That knowledge remained alive in the form of word and song.