At one point, the only species that walked the world was the Human, but the Aboleths warped the appearance, abilities, and memory of those who decided to channel the energy from a plane. Those who channeled Feywild took on a more elegant appearance and became the Elves, those touched by Sheol took on a sturdy but harsh appearance and became the Dwarves, and others became the Gnomes, Halflings, Orcs, and so on. Then there is the matter of created species; Half-Dragons are members of other species at birth, but through virtue or sin can be granted the appearance and power of a Dragon; Kobolds are born of the sin of an individual, and everyone is said to have one, whether they are big or minuscule. There are also those who are the result of two species interbreeding; Goliaths are the offspring of Humans and giants; Firbolg are the offspring of Elves and giants; Dragonborn are the offspring of a dragon in the Humanoid form and another sentient species, usually Human; and Aasimar are the offspring of a Couatl in their Humanoid form and another Humanoid, usually a Human.