Raktabija
Raktabij was a demon who fought with Shumbha and
Nishumbh against Durga or kali. Raktabij was given a boon that even if one drop
of his blood falls on the ground a duplicate Raktbij will be born. It is one of
the best boons that any body could ever get.
However Goddess Kali was smarter than him and just
swallowed every drop of his blood even before it touched the ground.