Bedsheet Ghost (5e Creature)

Medium construct, unaligned

Armor Class 13 (natural armor)
Hit Points 16 (3d8 + 3)
Speed 0 ft., fly 30 ft.

Damage Vulnerabilities radiant
Damage Immunities necrotic, poison, psychic
Condition Immunities blinded, charmed, deafened, exhaustion, frightened, paralyzed, petrified, poisoned
Senses blindsight 30 ft. (blind beyond this radius), passive Perception 8
Languages Common, Infernal
Challenge 1 (200 XP)

False Appearance.While the bedsheet ghost remains motionless, it is indistinguishable from a normal bedsheet or piece of cloth.

Grappler. The bedsheet ghost has advantage on attack rolls against any creature grappled by it.

Originally the creation of a childlike vampiress, bedsheet ghosts are exactly what their name implies: mundane bedsheets possessed by wandering lost souls of the netherworld. Having wandered for untold ages, these spirits have lost their sense of self and have no memory and very little will of their own. In short—an ideal servant.
Designed for capturing prey rather than for fighting enemies, bedsheet ghosts have very little directly offensive power. Their typical strategy is to lie in wait using their false appearance, before appearing suddenly with a startling shriek. If their prey is not stunned by the ambush, the bedsheet ghost will likely attempt to retreat. If successful, however, they will immediately wrap up the stunned victim inside of their bedsheet body, and fly away to take their catch back to their vampire master. A bedsheet ghost will usually try to bring prey in alive, but if the victim puts up too much of a struggle the bedsheet ghost can use its uncanny strength to squeeze them into submission or even crush them to death. A bedsheet ghost could also conceivably just fly up high and drop the victim to their death, but most bedsheet ghosts aren't intelligent enough to think of such a tactic and would likely be scolded for wasting blood if they did.
Despite their quasi-undead nature and origin as a vampire's servants, bedsheet ghosts are not inherently evil. If left to themselves without a master to order them around, a typical bedsheet ghost will spend its days pulling harmless pranks and jump scares. Curiously, they are also known to collect and hoard candy despite being unable to consume it. In general, bedsheet ghosts have the mentality of very small and very mischievous children. They can also speak, but they are only about as eloquent as a toddler.

Constructed Nature. A bedsheet ghost doesn't require air, food, drink, or sleep.