Will-o'-Wisp

Will-o'-wisps are malevolent, wispy balls of light that haunt lonely places and battlefields, bound by dark fate or dark magic to feed on fear and despair.
Hope and Doom Will-o'-wisps look like bobbing lantern lights in the distance, although they can choose to alter their colors, or wink out completely. When they activate their lights, will-o'-wisps offer hope, hinting of safety to creatures that follow them. Will-o'-wisps lure unwary creatures into quicksand pits, monster lairs, and other dangerous places so that they can feed on the suffering of their prey and revel in their death screams. An evil being that falls prey to a will-o'-wisp might become a wisp itself, its woeful spirit coalescing above its lifeless corpse like a flickering flame.
Consumed by Despair Will-o'-wisps a re the souls of evil beings that perished in anguish or misery as they wandered forsaken lands permeated with powerful magic. They thrive in swampy bogs and bone-strewn battlefields where the oppressive weight of sorrow stoops even heavier than the low-hanging mist and fog. Trapped in these desolate places of lost hope and memory, will-o'-wisps lure other creatures toward dismal fates and feed on their misery.
Agents of Evil Will-o'-wisps rarely speak, but when they do, their voices sound like faint or distant whispers. In the miserable domains they haunt, will-o'-wisps sometimes form symbiotic relationships with their wicked neighbors. Hags, oni, black dragons, and evil cultists work with will-o'-wisps to draw creatures into ambush. As their evil allies surround and slaughter creatures, the wisps hover above them, drinking the agony of a last breath and savoring the sensation as the light of life goes out in a creature's eyes.
Undead Nature A will-o'-wisp doesn't require air, drink, or sleep.

Will-o'-Wisp

Will-o'-wisps are malevolent, wispy balls of light that haunt lonely places and battlefields, bound by dark fate or dark magic to feed on fear and despair.

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Armor Class	19
Hit Points	9d4
Speed	0 ft.	Fly 50 ft. (hover)
Strength	1 (-5)
Dexterity	28 (+9)
Constitution	10 (+0)
Intelligence	13 (+1)
Wisdom	14 (+2)
Charisma	11 (+0)
Damage Immunities	Lightning	Poison
Damage Resistances	Acid	Cold	Fire
Necrotic	Thunder	Bludgeoning	Piercing
Slashing from non magical weapons
Condition Immunities	Exhaustion	Grappled	Paralyzed
Poisoned	Prone	Restrained	Unconscious
Senses	Darkvision 120ft.	Passive Perception 12
Languages	The languages it knew in life
Challenge	2 (450 XP)
Special 1	Consume Life	As a bonus action, the will-o'-wisp can target	one creature it can see within 5 feet of it
that has 0 hit points and is still alive.	The target must succeed on a DC 10 Constitution saving throw	against this magic or die.	If the target dies, the will-o'-wisp
regains 3d6 hit points
Special 2	Ephemeral	The will-o'-wisp can't wear or carry anything
Special 3	Incorporeal Movement	The will-o'-wisp can move through	other creatures and objects as if they were difficult terrain.
It takes 1d10 force damage if it ends its turn inside an object
Special 4	Variable Illumination	The will-o'-wisp sheds bright light in	a 5-to 20-foot radius and dim light for an
additional number of feet equal to the chosen radius.	The will-o'-wisp can alter the radius as a bonus action
Action 1	Shock	Melee Spell Attack	d20+4 to hit
Reach 5 ft., one creature	Hit 2d8 lightning damage
Action 2	Invisibility	The will-o'-wisp and its light magically become invisible until it attacks	or uses its Life Drain,
or until its concentration ends	(as if concentrating on a spell)