Cebruvass

• Who disturbs my solitude?
• How did you find me? No matter. You will die in this cave!
• I summon thee, to fight for me! Do not fail me this time!
• You're much stronger than I anticipated, but you will not leave this cave alive!
• All these years studying arcane magic and I am thwarted by the likes of you...

Cebruvass <Arcanist Hermit>

Type: Aberration (List)

Race: Mind Flayer (List)

Monster Manual classification: Mind Flayer

Alignment: Lawful Evil

Color Type: Red - Strong Named Enemy

Rare: Yes

CR:  ♦15Normal ●♦36Epic Normal

Attack: 

• Egowhip (Charisma damage, will save for half)
• Tentacle whip (Bludgeoning damage)
• Spellcasting (Save DC 13 + spell level + mind flayers charisma bonus)
  • Mind Blast - stun effect
  • Mind Thrust - force damage, will save negates
  • Extract Brain - instakill, can only be used if the target is already stunned
  • Hold Monster (at will)
  • Dominate Monster (at will)
  • Lightning Bolt (at will)
    

Special Qualities: Spell Resistance, DR /Byeshk, Telepathy, Inertial Armor

Habitat: 

• The Land of Barovia — accessed by being teleported to the lair through the Mysterious Mist — Slayer: Land of Barovia

Description:

Cebruvass introduces himself

At 2/3 of his health, and again at 1/3, Cebruvass will summon a number of Animated Arms.

Unlike Barovia's other rare encounters, Cebruvass does not appear randomly on the map - instead, he has a single guaranteed spawn point inside a hidden cave. This redoubt cannot be reached naturally, but certain patches of Mysterious Mist may teleport you there when interacted with.

Cebruvass can be a little tricky to find - unlike some patches of mist, which have fixed locations and destinations, the patch of mist that takes you to him is randomly located (if it spawns at all). One known location is en route to Berez, where a mist patch may spawn near the road almost directly east of Argynvostholt. Regardless of where the patch was, leaving his cave will deposit you in a waterfall some distance east of Van Richten's Tower.