Servants of the Demon Bat. Chupacabras are sometimes bred underground by derro worshippers of the demon lord of bats, the Demon Lord of Bats. The sudden appearance of the creatures in a locality may indicate the presence of Demon Bat cultists below ground. Worse, whispered rumors tell of chupacabras with bat-like wings created by the derro savants under direction from their dreaded mi-go allies.