[The ability to steal and reattach appendages comes from the source material. Since the sazae-oni is yet another female only shapeshifter, you may not be surprised to learn that the body part removed and reattached were testicles. Although the sazae is a turban snail, I added some cone snail in as well, for the poisonous sting.]
Oni, Sazae-oni This creature’s torso resembles that of a shapely woman, but the rest
of its body is anything but. A thick tail grows where the legs should
be, and its head is the shell of an immense snail. Two probing eyes on
stalks emerge from the shell.
Sazae-oni are one of the few
fully aquatic oni, being formed from spirits envious of the free lives
of the merfolk and other ocean-dwelling humanoids. Despite their power,
they are among the most
petty and spiteful of the oni, wreaking massive havoc to avenge trivial
slights.
Like the gastropods they superficially resemble, all sazae-oni are
hermaphroditic, capable of acting as a male or female as they please.
Sazae-oni are lustful creatures, and many half-fiends and tieflings with
oni blood can trace their ancestry back to one of these creatures.
Sazae-oni are sculptors of flesh, capable of removing and attaching
appendages from their victims as easily as a human can change clothes.
Sazae-oni use this power to extort tributes of gold or slaves from their
victims and the mightiest of sazae-oni have armies of slaves befuddled
by mind-influencing magic and rendered monstrous through stolen, grafted
body parts.
Sazae-oni prefer to avoid fair fights, beguiling their way into an
enemy’s confidence with a false face and charming words before slaying
or enthralling him. If discovered and forced into battle, sazae-oni
remain mobile and strike with their tails and sharp, harpoon-like sting.
This sting delivers potent paralytic venom, incapacitating enemies for
the oni to remove or replace appendages from at its discretion.
Sazae-oni are usually associated with drifters, and some clans that formed just after the fall of the Kingdom of Kown-Dam did fall under the sway of these wicked creatures. These clans still ply the seas, acting to satisfy their hedonistic benefactor’s whims.
Shores of Swords 