they are the mermaids from pirates of the Caribbean. They are blood thirsty creatures that looks like female human but are mermaids with long tails and vampire fangs. They doesn’t hesitate to kill and they do anything to get blood

now you are sitting in a boat with two friends and you turn around. When you turn again, your friends are gone, except for one ear and two eye globs

when you looks down in the water, you see a shadow and then behind you you hear…

“Here I am”