Monster Spotlight: Nochlean
CR 3
Adventure Path: Return of the Runelords: Secrets of Roderic's Cove, pg. 84-85
Creeping through the shadows, slipping past cracked doors, creeping in through windows, and slithering under beds, these cruel and malicious Fey live for the thrill of being the boogeyman that terrorize sleepy little towns at night. Nochleans are rotten through and through, existing only to cause pain, misery, death, and despair with no purpose or reason, compelled by their very nature to vandalize homes, slay pets and livestock, and steal away children in the dead of night. Notably, that last one is explicitly a hobby; nothing is more entertaining for them than watching a family have a breakdown over one of their young ones going missing, and Nochlean gain nothing from the activity--they don't even eat the stolen child, magically convert them into more fey, or demand a ransom! They just do it for the love of the game.
To this end, Nochlean possess the eerie Child Scent ability, able to sniff out humanoid children no matter where they may hide, navigating perfectly through the darkness of any house. Their long nails and dexterous fingers can be used like a set of lockpicks, letting them use their +9 to Disable Device without any actual tools, and their wiry frames and light bodies grant them +12 to Stealth. With the ability to use Spider Climb at 3/day, even hiding one's children on second floors is little defense, and a 3/day Sleep available assures that their stolen cargo remains knocked out... and any parents who barged in to see the fiend are quickly rendered non-issues.
This isn't the only magic available to these fiendish Fey, as they can use Open/Close and Mage Hand at will to mimic hauntings, misdirect anyone looking for them, and pilfer small items with little fanfare. Ventriloquism also allows them to make their words sound like they're coming from everywhere, such as from outside a window, from inside a wardrobe, from under a bed, or from directly behind you when you least expect it. The highest-power spell Nochlean have available to them is usable only once a day, but it's a doozy: Dimension Door. Thankfully, while it's frustratingly useful when the Fey needs to escape the scene of its other crimes, the rules of consenting to magic in Pathfinder are pretty strict: even if a target is knocked out by Sleep, the Nochlean cannot then grab them and D-Door out. The targets of D-Door MUST be willing, even if unconscious, so the kidnappers have to get creative if they want to teleport away with their prizes. Normally this is through their +10 to Bluff, enough to fool most children that aren't immediately frightened by their appearance (or aren't frightened enough into compliance), but if that doesn't work they have little other choice but to do things the hard way.
Like most "bully" Fey, Nochleans are built to be frightening and tricky, but if an enemy isn't intimidated by their bluster or their magical antics, they're more likely to flee than fight. UNLIKE most bully Fey, Nochlean are actually able to fight, they just prefer not to. Their sole offensive action is a pair of claw attacks... but, as mentioned, their lengthy claws are sturdy and sharp enough to be used as tools, and thus deal MORE damage than the average claw attack at 2d6 per strike. Each claw also Grabs whatever is hit, and their lack of Strength is a smokescreen to cover for the fact their Agile Maneuvers feat grants them +10 to grapple checks, letting them hold fast to creatures that would normally be able to escape without issue.
Nochleans are further protected by DR 5/Cold iron, preventing most peasant weapons from dealing meaningful damage to them... but they have a very notable and very pronounced weakness that means even the average 1 Hit Dice citizen has a chance to escape or repel the foul Fey: Music Susceptibility. The exaggerated ears of a Nochlean grant it numerous benefits, such as wrapping around their heads and necks to help disguise their true nature when wandering among mortals, and a +4 to Perception checks, but their heightened hearing also saddles them with a Vulnerability to Sonic and an unpredictable reaction to hearing any music. The book notes that Nochleans cannot stand the sound of music and often try and flee it as swiftly as possible, with even simple whistling acting as a deterrent for one, but their Music Susceptibility tells something of a different story.
It gives anyone near the Nochlean the ability to make a Perform check using (Keyboard, Percussion, Sing, String, or Wind), with the Nochlean then having to make a Will save equal to the Perform result. So long as the music continues to play, the foul Fey suffers a different debuff based on the Perform: Keyboard inflicts sickened, percussion inflicts shaken, string inflicts stagger, wind inflicts confusion... but singing inflicts Rage. While this renders them unable to use any tactics more complicated than running up and clawing at someone and lowers its AC from 15 to 13, it does mean the boogeyman's base damage rises to 2d6+1 AND it gains +5 hitpoints, making it harder to take out and slightly more likely to take someone else with it. All of these debuffs (and one buff) last until the music stops, and given how common lutes (stagger) and flutes (confusion) are among adventuring parties, this frequently allows the players to swiftly pile on and dispatch the fey... provided it doesn't D-Door away.
Of course, perhaps the real problem isn't killing the Nochlean, but finding out where it's been taking people. The book grimly notes that Nochlean steal children just for fun, so many pragmatic ones will actually sell their talents to other vile and unrepentant souls, exchanging their stolen victims for wealth and finery without asking questions. Nochlean serve as good introductory antagonists for a campaign at lower levels and can be run as solo threats (they detest sharing territory with others of their kind), but even more than this, the presence of one can easily expose greater plots and much deeper corruptions going on in the background! We love a good multi-use monster!