Tyranny of Dragons
Humans in Toril are widespread, can be found in most regions and, in general, are fierce and disagreeable, which can sometimes lead certain other races to view them with contempt. They are renowned for their diversity and ambition, and although they lack specialization, they can excel in many areas.
The origin of humanity is something yet unknown. Although the Tel-quessir can claim the primal war between Corellon and Gruumsh for their heritage and the dwarves claim to have been forged from the rocks of Abeir-Toril itself, humans have no unifying creation myth. However, they are certainly an ancient race, having originated since before written records exist and they are frequently considered one of the creator races. More confusing yet is that, while humans indeed are native to Toril they have been found on other worlds as well, with the Mulani standing out as an example of human immigrants to Toril.
Regardless of their precise origins, humans have been undeniably successful. While hardly the only dominant race of Toril, humans are one of them and the most recent to obtain dominance. In spite of this strength, or perhaps because of it, humanity is an eternally fractured and divided race, broken up into over a dozen ethnic offshoots. It is believed that this is in part because humanity, unlike most other races, did not emerge as a whole but rather in several places at once, thereby resulting in its diversity.