Huecuvas are the risen corpses of heretical clerics who blasphemed and renounced their deities before meeting death. In unlife, they hate and seek to destroy those pious souls who keep their vows.
Although easily mistaken for zombies or even skeletons, huecuvas have a spark of intelligence that makes them cunning and deceptive foes. During daylight hours, a huecuva becomes shrouded in an illusion that causes it to appear as it did in life—at these times, a huecuva might seek to infiltrate society to dwell among those it hates. When night falls, it emerges to seek out its prey. Fortunately for the living, the typical huecuva has only fragments of intellect remaining, so it is usually not long before the undead creature makes an error of judgment or simply reveals itself for the monster it is.