Nephelym

Nephelym are a mysterious race of monster-human hybrids. Most of them have roughly the intelligence of animals.

Wild Nephelym are the ones you will capture and breed, they come in hominal (monster girl) and feral (furry) varieties.

Blessed Nephelym
Rare mutations produce powerful, sentient creatures with human intellect. They are almost always female.

Blessed Nephelym cannot be caught, but "interacting" with them will be key to success in your quest.