Relentless Slasher

Medium Fiend, Neutral Evil

AC: 15

Initiative: +4 (14)

HP: 91 (14d8 + 28)

Speed: 40 ft.

STR: 12 (+1)
DEX: 18 (+4)
CON: 14 (+2)
INT: 14 (+2)
WIS: 15 (+2)
CHA: 16 (+3)

Saving Throws: Str +4, Dex +7, Con +5, Wis +5

Condition Immunities: charmed; frightened

Senses: Darkvision 120 ft., Passive Perception 12

Languages: understands all but can't speak

CR: 8 (XP 3,900; PB +3)

Habitat: Any

Treasure: Armaments

Legendary Resistance (1/Day).

If the slasher fails a saving throw, it can choose to succeed instead.

Actions

Multiattack.

The slasher makes two Slasher's Knife attacks.

Slasher's Knife.

Melee or Ranged Attack Roll: +7, reach 5 ft. or range 30/60 ft. Hit: 9 (2d4 + 4) Slashing damage plus 21 (6d6) Necrotic damage.

Legendary Actions

Legendary Action Uses: 3. Immediately after another creature’s turn, this creature can expend a use to take one of the following actions; it regains all expended uses at the start of each of its turns.

Homing Knife.

Dexterity Saving Throw: DC 15, one creature within 120 feet that the slasher has hit with its Slasher's Knife attack within the last 24 hours. Failure: 11 (2d6 + 4) Slashing damage.

Vanishing Strike.

The slasher makes one Slasher's Knife attack, then teleports up to 30 feet to an unoccupied space it can see. The slasher can't take this action again until the start of its next turn.

Find this creature in the encounter builder

Source: Ravenloft: The Horrors Within, p. 262 - Licenses and attribution