What is the meaning of Mulo?

A vampire.

mule

first-person singular present indicative of mulir

mule

dative/ablative singular of mūlus

male mule (hybrid offspring of a male donkey and a female horse)

male mule

dead, deceased

dead person, the deceased

ghost

bastard (person who was born out of wedlock)

mule

Source: wiktionary.org