The Apatosapien is a bipedal, intelligent dinosaur, descended from the giant herbivores of long ago. It stands about 6 feet tall, though it can raise its head up to 10 or 12 feet if necessary. Its upper limbs have evolved to resemble humans arms and hands, though its lower limbs are more like those of dinosaur. It can speak Common, its own language, and generally wears robes.

Like many other species, apatosapiens survived extinction on islands and in other isolated environments. They evolved along with the other sentient species, though they have little contact with them. Some live in tribes and some in religious communities. They are excellent farmers and herbalists. Many spend their free time as scholars. They preserve their history in writing and in stone carvings. In tribal villages there will always be a shaman with 1d4+1 levels of Clerical abilities. In their religious communities, all members will have 1d4+1 levels of Clerical abilities.

Apatosapiens are peaceful beings, but they will fight if threatened. They use large wooden staffs and have a vocalization defense. At the start of combat, all apatosapiens will chant in a long, low tone. Ogre-sized or smaller opponents must make a saving throw vs. Paralysis or be immobilized for 1d6 rounds. This saving throw is only made once: successful PCs are immune to the chant for the remainder of that combat. Apatosapiens may immobilize up to their own number of opponents. They do not kill immobilized opponents, but may strip them of their weapons or restrain them with ropes.