Traits

Enjoy Your Life: The will-o’-wisp can target any creature it sees within 5 feet of it. It has 0 hit points, and is still alive. The target must succeed on a DC10 Constitution saving Throw that is against this magic or die. However, if the target does not survive, then the will o’-wisp will regain 10 (3d6) Hit points.

Ephemeral: The dnd 5e willo’-wisp cannot wear or carry anything.

Incorporeal Movement: This will-o’wisp could actually travel through other creatures and objects as if they were in difficult terrain. Normaly, it takes 5 (1d10) damage to end its turn within an object.

Variable Illumination: The will-o’wisp can emit bright light from a distance of about 5ft to 20ft. It also has the ability to dim the light for an additional length equal to a certain radius. The radius can be altered by the will-o’-wisp as a bonus action.

Take Action

Shock: This shock action can cause a dnd beast to use a Melee Spell attack: +4 to hit, reach five feet, one creature. Hit: 9 (2d8) lightning damage.

Invisibility: The willo’-wisp and its light can magically become invisible until it attacks or uses its consume lives, or until its Concentration is over (as though it were concentrating on a spell).

Attributes Of Will-o’-Wisp DnD 5E Monster

AC 19
Alignment Chaotic Evil
CHA 11
CON 10
Challenge Rating 2
Immunities to certain conditions Exhaustion, Grappled.
DEX 28
HP 22
Hit Dice 9d4
INT 13
Immunities Lightning, Poison
Languages The languages it spoke in daily life
Passive Perception 12
Resistances Acid, Cold and Fire, Necrotic; Thunder; Bludgeoning.
Roll 0 1d20+4 – 2d8
STR 1
Senses Darkvision 120 feet
Size Tiny
Speed Fly 50 feet (hover), 0 ft.
Type Unreachable
WIS 14