Homebrew, Ravenloft: Denizens of Darkness (3.5e)
Aura of Despair. The bussengeist radiates an aura of despair in a 120' radius. All creatures that are not constructs or undead within this radius must make a DC 12 Wisdom saving throw. On a fail, the creature has disadvantage on ability checks & saving throws that use Intelligence, Wisdom, or Charisma. On a success, the creature is immune to this bussengeist's aura for the next 24 hours.
Incorporeal Movement. The bussengeist 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.
Invisibility. The bussengeist is invisible.
Sunlight Sensitivity. While in sunlight, the bussengeist has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.
Forceful Slam. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 10 (3d6) force damage.
Phantom Shift. The bussengeist targets a creature that is not a construct or undead within 60' of it. The targeted creature makes a DC 12 Intelligence saving throw. On a failure, the creature experiences the effects of the spell Phantasmal Force with the illusion being a recreation of the bussengeist's tragic death. On a success, the creature is immune to this bussengeist's phantom shift ability for the next 24 hours.
Underdark, Urban