Treacherous Thief

Medium undead, lawful evil

13 (+1) 24 (+7) 17 (+3) 14 (+2) 16 (+3) 18 (+4)

Armor Class 19 (studded leather)
Hit Points 120 (16d8 + 48)
Speed 30 ft., climb 30 ft.
Saving Throws Dexterity +11, Charisma +8
Skills Acrobatics +15, Investigation +10, Perception +7, Sleight of Hand +15, Stealth +15
Damage Immunities necrotic, poison, psychic
Condition Immunities charmed, exhaustion, frightened, poisoned
Senses darkvision 60 ft., passive Perception 17
Languages the languages it knew in life
Challenge 12 (8,400 XP)

Special Traits

  • Sneak Attack. Once per turn, the treacherous thief deals an extra 8d6 damage when it hits a target with a weapon attack and has advantage on the attack roll, or when the target is within 5 feet of an ally of the thief that isn’t incapacitated and the thief doesn’t have disadvantage on the attack roll.
  • Cunning Action. The treacherous thief can use its bonus action to take the Dash, Disengage or Hide action.
  • Evasion. If the treacherous thief makes a Dexterity saving throw to take half damage, it takes no damage on a successful saving throw and half damage on a failed one.
  • Innate Spellcasting. The treacherous thief can innately cast the following spells, requiring no material components:
  • Unhallowed. If damage would reduce the unhallowed to 0 hit points and it is not on holy ground, or has not had its true name and secret revealed, the unhallowed is reduced to 1 hit point instead.


  • Multiattack. The treacherous thief makes two attacks with its shortsword or shortbow.
  • Shortsword. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 10 (1d6 + 7) piercing damage.
  • Shortbow. Ranged Weapon Attack: +11 to hit, range 80/320 ft., one target. Hit: 10 (1d6 + 7) piercing damage.


A treacherous thief hunted by heroes will always try to choose the battleground if at all possible. It prefers large structures with many shadows and hiding places or similar urban environments. It will strike from the shadows, always using its stealth to its advantage. It will use mage hand to create distractions and expeditious retreat to move very quickly from area to area.


The treacherous thief was cursed by the gods for betraying the trust of others, all for petty greed. It once used its skills to steal from those who had almost nothing to call their own, simply for the joy of taking. It killed for a handful of coins, or just to watch them die. And now there is no treasure in the world rich enough to buy its way out of damnation.

The treacherous thief disguises its hideous features with spells of illusion and skulks in the shadows, striking with surprise. When it ventures into the open, it wears a pleasant face and fancy clothes to beguile its unwitting victims.

Worthless Wealth. To one who is centuries dead, wealth is nothing but a cruel joke. The pleasures of the flesh mean nothing when the flesh is rotten. The thief now takes what satisfaction it can in depriving others of precious or holy artifacts, setting brother against brother by theft and innuendo and corrupting nobles for its own amusement.

Section 15: Copyright Notice

Creature Collection 5e Copyright 2020 Onyx Path Publishing, Inc.