Lovecraft's Mythos "Star Vampire" (The Shambler from the Stars)
A creature that is often invisible but can be detected by a horrifyin' laughter it makes before strikin' it's victim.
It then starts to drain the victim's blood usin' it's tentacles, as the blood drains, his body is filled, makin' it visible,
it will stay that way until all the blood is digested, becomin' invisible once again.
#Lovecraft