Redcap

Redcaps were evil murderous fey with an insatiable bloodlust. They appeared in the Feywild, or at places where creatures acted on a deep desire for bloodshed.

Description
They resembled tough and elderly men, 3–4 feet tall and 50 pounds in weight, with leathery skins, with evil smiles filled with wickedly sharp, protruding teeth. They wore iron boots and the bright red caps for which they were named; these were soaked in fresh blood. They also carried scythes that seemed much too big for them.

Abilities
Redcaps needed to kill constantly in order to continue existing, absorbing a little of the essence of everything they slew. Their pointed red hats needed to remain soaked in fresh blood, which had to be replenished at least once every three days, otherwise the redcap would simply disappear, a fact they are entirely aware of. Their scythe and boots are spawned naturally with them.abandoned

A redcap that reached great age had possessed terrible strength and was practically invulnerable.

When it died, a redcap vanished completely, leaving behind just one tooth.

Personality
Vicious and cruel fey, redcaps were insane serial killers who thrived on others' pain. They dipped their caps in the blood of those they'd killed.

Society
Forming small gangs, redcaps usually lurked within caves and old keeps and towers, usually abandoned after some tragedy or after massacring any former inhabitants.

With hot tempers, redcaps argued and brawled with one another incessantly, usually to the death. They would slaughter each other without hesitation, but refused to soak their caps in another redcap's blood, for fear of a curse. It required an elder redcap, even more than one, to reign in their tempers and murderous impulses, mostly by bullying the youngers.

They spoke Sylvan and Common.

Lands
Redcaps existed all around Faerûn, but were a special threat in the halfling realm of Luiren.

Rumors & Legends
In halfling fairy tales, redcaps were said to be former halflings cursed as punishment for betrayal, but these were just stories and nothing more.