Have only read the introductory chapter. The blurbs on Heroes and particularly monstrous Beasts are about what I expected for a Night Horrors book.

The Insatiables my first thought being:

"...so they're just Idigam for Beasts?"

Complete with the whole being an ancient race of creatures older then Beasts, being apart of an unknowable section of the Begotten's home turf, their primary deity casting them out but not able to definitively kill them, and now them being back to make the Begotten as miserable as possible. Haven't heard that one before....