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Drow noble nightmare lord half-invidiak shadow lord shadowfire chameleon rogue 1/slayer 14
CE Medium outsider (native, augmented humanoid [elf], evil)
Init +13; Senses see in darkness; Perception +22
Aura fear 60 ft (shaken, DC 30), frightful presence (DC 30)
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DEFENSE
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AC (corporeal) 24, touch 23, flat-footed 11 (+13 Dex, +1 natural, +2 deflection vs good)
AC (incorporeal) 36, touch 36, flat-footed 23 (+13 Dex, +13 deflection)
hp 115 (15 HD; 1d8+1 plus 14d10+28); regeneration 5 (good or silver weapons)
Fort +10, Ref +24, Will +8; +4 vs. illusions, +13 vs mind-affecting, +2 vs. enchantments
Defensive Abilities regeneration 5 (silver or good), shadow blend, incorporeal step; DR 20/magic; SR ???; Immune cold, fire, poison, sleep, automatically disbelieves illusions; Resist acid 10, electricity 30, +4 vs illusions, +2 vs enchantments, +2 vs good
Weaknesses light blindness
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OFFENSE
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Speed 30 ft., fly 60 ft. (perfect)
Melee +1 keen conductive ghost touch falcata +29/+24/+19 (1d8+14 plus 2d6 negative energy (Fort DC 30 half)/17–20/x3; 1 Con dmg [Fort DC 30 negates])
Space 5 ft.; Reach 5 ft.
Special Attacks sneak attack +5d6, studied target +3, assassinate (DC 24), deadly sneak, hunter’s surprise, nightmare magic, smite good, night terrors, dream slave, cloying gloom blast 3/day (DC 30), slayer’s advance 1/day
Spell-Like Abilities (CL 15th; concentration +28)
Constant—detect magic, protection from good,
At-will—dancing lights, deeper darkness, faerie fire, levitate, ray of sickening (DC 24),
6/day—shadow step
4/day—shadow conjuration (DC 31), suggestion (DC 26)
3/day—deep slumber (DC 26), detect thoughts (DC 25), dream, invisibility, nightmare (DC 32), plane shift (DC 30, Material Plane and Dimension of Dreams only), shadow evocation (DC 32), unholy aura (DC 31) telekinesis (CMB +28, DC 28)
2/day—magic jar (DC 28)
1/day—blur, dispel magic, divine favor, feeblemind (DC 28), greater shadow conjuration (DC 34), greater teleport, modify memory (DC 28), shadow walk, unholy blight (DC 27)
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STATISTICS
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Str 10, Dex 36, Con 12, Int 20, Wis 18, Cha 36
Base Atk +14; CMB +14; CMD 37
Feats Ability Focus (assassinate), Dastardly Finish, Demonic Possession, Exotic Weapon Proficiency (falcata), Improved Possession, Merciless Butchery, Penetrating Possession, Slashing Grace (falcata)*, Spirit Vision, Steadfast Personality, Weapon Finesse*, Weapon Focus (falcata)*
Skills Acrobatics +31, Bluff +31, Craft (alchemy) +23, Diplomacy +31, Disguise +31, Fly +26, Heal +22, Intimidate +35, Perception +22, Sense Motive +22, Stealth +43, Use Magic Device +31; Racial Modifiers +4 Intimidate, +12 Stealth
Languages Abyssal, Celestial, Common, Draconic, Elven, Infernal, Undercommon
SQ misdirection pool (15), ghostly form (15 rounds/day), feign death (DC 30), swift tracker, stalker, planar thinning 1/day
So, I decided to draw together almost every scary template to create the creepiest adversary ever. The result is almost hilariously complex, and I have no idea what CR it actually is.
I also don't have a clear idea of what its story is, and it needs a good story to explain the ludicrous mishmash of templates. Anyone have any ideas?
Also, as a combat encounter, I'm having trouble thinking of any particularly standout strategy.