Monstrous Monday: Neh-thalggu (Brain Collector)

One of my favorite adventures is X2 Castle Amber. It covers so much of what I love in an adventure. Plus it is full of great Clark Ashton Smith homages and nods.

Among these homages is the Neh-thalggu or the Brain Collector.  It is such a creepy ass monster and I really love them. 

If the amount of OGC on them is any indication, then others like them too. You can find them for d20 3.x style, Pathfinder, and 5e.  This is in addition to official D&D stats for Basic and AD&D 2nd Ed.

Neh-thalggu (Brain Collector)

NO. ENCOUNTERED: 1
SIZE: Large
HD: 14 (d10) (77 hp)
MOVE: 60 ft.
AC: 16 (natural armor)
ATTACKS: Bite (1d10) + Poison (Save vs. Con or Paralyze), Claws (1d6) 
SPECIAL: Brain collection, Incorporeal, Spell Casting
SAVES: M
INT: Genius to Supra-genius (20-22)
ALIGNMENT: Chaotic Neutral
TYPE: Aberration
TREASURE: 8
XP: 6,000

The neh-thalggu, also known as the Brain Collector, is a creature from the Outer Darkness.

Neh-thalggus hail from distant worlds, traveling the gulfs of space on immense living ships that swiftly decay when they land upon a new world, leaving behind a deadly cargo of hungry monsters. Neh-thalggus are crablike nightmares with lamprey-like mouths, twitching eyes on their legs, and several blisters along their back that hold human brains. Some speculate that neh-thalggus encountered in this reality may merely be juveniles of their kind, perhaps exiled from their home worlds by greater kin until they can prove their worth on other worlds.

Combat: Neh-thalggu attack with their mouths they attempt to latch on with their mouths and claws to extract the brain from their victims.  They attack primarily with their mouths (bite) and then try to latch on with their claws.  On a successful bite and claw attack the victim must make a Constitution save or become paralyzed. Once paralyzed the creature will remove the victim's brain. 

Brain Collectors. Neh-thalggus are carnivores, but they do not digest humanoid brains they eat, rather, these brains lodge in one of several bulbous blisters on the creature's back and help to increase its intellect. Their brain collections may be a morbid form of currency in their home realm, or the thoughts in these brains may merely be fuel for a dark apotheosis into an even more sinister mature form.

Incorporeal: A neh-thalggu is not wholly in our reality but always remains partially extradimensional. Thus it can be harmed only by other incorporeal creatures, +1 or better weapons, magic, or psionics, with a 50% chance to ignore any damage from a corporeal source. It can pass through solid objects at will, and its own attacks pass through armor (except for its bite attack, which is treated as if a corporeal attack). It always moves silently unless it chooses otherwise.

Mind Masters. Neh-thalggu masters lord it over their lesser kin by applying the drained brainpower of their victims toward mastering psychic magic and mesmerism. They may inhabit elaborate mindscapes as their lairs or may subtly influence the thoughts and senses of creatures they lure into their lair in furtherance of convoluted plots to manipulate the societies around them while they dwell in secret. Some dwell alone or with mind-controlled slaves, while others organize clusters of their own kind to spread their sinister schemes and feed their insatiable alien hunger.

Spell Casting. Neh-thalggu can cast spells as 1st level wizard. For every brain, they collect they add one more level of spell casting for a maximum of 12 brains to 13th level wizard.  For this reason Neh-thalggu will target wizards and other magic-using characters.

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Might need some tweaks, but yeah this is one nasty beastie. 

The plot hook is obvious. A bunch of never before seen monsters are attacking the countryside the day after a shooting star was seen. Worst of all are reports of a "ghost monster" that feeds on brains. 

Don't forget the Indiegogo campaign for Amazing Adventures going on right now!  Grab the books and you can use this guy.