Armor Class 15
Hit Points 153 (18d8 + 72)
Speed 40 ft.
Saving Throws Dex +10, Con +9, Wis +10
Skills Arcana +7, History +7, Intimidation +8, Perception +10, Religion +12
Damage Immunities poison; bludgeoning, piercing, and slashing from nonmagical attacks
Condition Immunities charmed, exhaustion, frightened, grappled, paralyzed, petrified, poisoned, restrained
Senses truesight 60 ft., passive Perception 20
Languages the languages it knew in life, telepathy 120 ft.
Challenge 13 (10,000 XP)
Incorporeal Movement. The haugbui can move through other creatures and objects as if they were difficult terrain. It takes 5 (1d10) force damage if it ends its turn inside an object.
Sunlight Sensitivity. While in sunlight, the haugbui has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.
Turn Resistance. The haugbui has advantage on saving throws against any effect that turns undead.
Undead Nature. The hangbui doesn't require air, food, drink, or sleep.
Multiattack. The haugbui makes three Psychic Blast attacks. It can replace one attack with a use of Spellcasting.
Psychic Blast. Melee or Ranged Spell Attack: +10 to hit, range 120 ft., one target. Hit: 27 (5d8 + 5) psychic damage.
Invisibility. The haugbui magically turns invisible until it attacks or casts a spell, or until its concentration ends (as if concentrating on a spell). Any equipment the haugbui wears or carries is invisible with it.
Spellcasting. The haugbui casts one of the following spells, requiring no components and using Wisdom as the spellcasting ability (spell save DC 18):
At will: dancing lights, mending, purify food and drink, spare the dying
3/day each: gust of wind, telekinesis
1/day each: dispel magic, remove curse
