Raktabija

In the Devimahatmya, the earliest and
most important textual source for the
worship of the Goddess, Raktabija is the
name of one of the demons vanquished
by the goddess Kali. Raktabija has
received the boon that any drop of his
blood falling to the earth will instantly
turn into another version of himself,
rendering him practically unconquerable. Kali defeats this demon by drinking his blood as it is shed, until finally it
is completely gone, and so is he.