In Mayan mythology, Camazotz was a bat god. He was the central god of an ancient Mayan cult which may have owed its existence to giant vampire bats which are now extinct.
In the Popol Vuh, Camazotz are the bat-like monsters encountered by the Maya Hero Twins Hunahpu and Xbalanque during their trials in the underworld of Xibalba. The twins had to spend the night in the House of Bats where they squeeze themselves into their own blowguns in order to defend themselves from the circling bats. Hunahpu stuck his head out of his blowgun to see if the sun had risen and Camazotz immediately snatched off his head and carried it to the ballcourt to be hung up as the ball to be used by the gods in their next ballgame.
"A bat god of Mayan mythology. He lives in the Hall of Bats, which stands in Xibalba, the underworld and home of the gods of death. Camazotz took the form of a giant bat, with razor-sharp claws and giant fangs. He also had a sharp, knife-shaped nose, and used his vaunted nose and claws to attack his prey. Camazotz is well-known for cutting off the head of the hero One-Hunahpu. His sons, Hunahpu and his twin brother Xbalanque, later took back his head and defeated the gods of death, but the twins eventually met their doom in battle."
—Shin Megami Tensei IMAGINE compendium
Camazotz can only be obtained through fusion. He appears in the Shibuya Quartz gold level instance.
Shin Megami Tensei: Strange Journey
"An evil bat who dwelled in Xibalba in Mayan lore. When the heroic twins Xbalanque and Hunahpu went to Xibalba, he decapitated Hunahpu at the Bat House."
—Shin Megami Tensei: Strange Journey compendium
Shin Megami Tensei IV
Camazotz can be found in Kiccigiorgi Forest and the lowest levels of Naraku. He can teach Flynn the Tetanus Cut and Life Drain skills through his Demon Whisper.
Digital Devil Saga: Avatar Tuner
Camazotz is the avatar of Bat and is fought several times through the first game.
Digital Devil Saga: Avatar Tuner 2
Bat's Solar Data is raving at the end of the 3rd Layer of the Sun, stuck reliving events shortly before his death. He will transform into Camazotz and engage the party as soon as they enter the chamber. His power and abilities are similar to his last encounter with the party.
When he gets low on HP, he will use Psycho Rage and cast Zotzilaha Bane on all the party members to turn them into bats. While inflicted with Bat status, the party's overall combat ability will be reduced, especially accuracy. When a party member reverts to normal, their MP will be halved.