Camazotz the Death Bat

Also known as the Death Bat and Sudden Bloodletter, Camazotz was the bat god of the ancient Mayan people. This vampiric winged demon was the god of darkness, violence, and sacrifice (especially blood sacrifice). The name Camazotz itself is derived from two words in the K'iche' language: kame, which means "death," and sotz', meaning "bat." Camazotz was said to inhabit Xibalba, the Mayan version of Hell. This nightmarish creature reveled in the slaughter of innocent people, and was said to be especially fond of drinking human blood. Those who devoted themselves to this deity would open a vein, fill a wooden or ceramic bowl with their blood, and would offer it up to the Death Bat.

Originally, Camazotz was an anthropomorphic bat-monster worshipped by the Zapotec Indians of Oaxaca, and was later adopted by the Mayans as a vampire god that demanded offerings of blood from it's followers in exchange for the deity's favors or aid. Camazotz is featured prominently in the Popul Vuh, a compendium of Mayan mythology and beliefs. In Xibalba, the demon presides over a house of gigantic bat-creatures like himself, the only difference being that they acknowledge the Death Bat as their lord and master.

More research is forthcoming!

Sources

http://en.m.wikipedia.org/wiki/Camazotz#section_1

http://www.blueroadrunner.com/camazotz.htm

http://ferrebeekeeper.wordpress.com/2011/04/06/camazotz-the-death-bat/