Still under construction.
The following fiend is inspired by felhunters and felstalkers from World of Warcraft.
FEL'FANG CR 4
NE Small outsider (evil, extraplanar, fel'fiend)
Init +2; Senses darkvision 180 ft., low-light vision, see in darkness,
scent, spellsight, Perception +14
AC 17, touch 13, flat-footed 15 (+2 Dex, +1 size, +4 natural)
hp 37 (5d10+10); regeneration 1d2–1 (any)
Fort +5, Ref +6, Will +6; +4 vs. disease and poison
DR 5/magic; SR 15; Immune ability drain (taken as ability damage),
death by massive damage, death effects, energy drain, paralysis,
petrification, phantasms, involuntary polymorph effects, sleep effects
Resist acid 10, cold 10, electricity 10, fire 10, negative energy damage 10,
psychic energy damage 10, sonic 10
Defensive Abilities cosmic defiance, devour dweomer
Speed 80 ft., climb 40 ft., swim 60 ft.
Melee bite +9 (2d6+4 plus 1d4 bleed plus trip)
Space 5 ft. (long); Reach 5 ft.
Special Attacks bleed (1d4), cosmic strike, nether lock (DC 16)
Str 15, Dex 15, Con 15, Int 10, Wis 15, Cha 15
Base Attk +5; CMB +7; CMD 19 (23 vs. trip)
Feats Combat Reflexes, Great Fortitude, Seize the Opportunity
Racial Bonus Feats Ability Focus [nether lock], Conceal Scent,
Diehard, Endurance, Improved Natural Attack [bite],
Lurker in Darkness, Mobility, Spring Attack, Weapon Focus [bite]
Skills Acrobatics +8, Bluff +6, Climb +14, Escape Artist +8,
Knowledge (planes) +4, Perception +14, Sense Motive +10,
Spellcraft +8, Stealth +14, Survival +10, Swim +14
Racial Modifiers +4 Perception, +4 Sense Motive,
+4 Survival when tracking by scent
Languages Abyssal, Aklo, Infernal; telepathy 300 ft.
SQ concealed alignment, cosmic tolerance, deft drop, no breath,
powerful bite, powerful build, swift tracker, trackless step
Concealed Alignment (Ex) Fel'fiends radiate no alignment aura. This affects only alignment detection, not effects that cause harm or are otherwise based on alignment.
Cosmic Defiance (Ex) When and wherever it is advantageous for them, stunned or cowering fel'fiends are only considered dazed.
Cosmic Strike (Su) The natural weapons of fel'fiends, as well as any weapons they wield, are considered ghost touch seaborne weapons and overcome all forms of damage reduction based on magic, alignment or material.
Cosmic Tolerance (Su) Fel'fiends adapt to hostile environments as per adapt body (psionic power).
Deft Drop (Ex) A fel'fang in true form may ignore the first 30 feet of any fall when calculating falling damage. When taking no damage from a fall, one does not fall prone.
Devour Dweomer (Su) Once per minute as a free or immediate action, a fel'fang may attempt an effective caster level check to dispel any single ongoing spell or spell-like ability it can perceive with its spellsight as if by greater dispel magic. Doing so successfully heals that fel'fang for hit points equal to the spell level + the caster level of the effect dispelled.
Nether Lock (Su) Once per minute as a free or immediate action, a fel'fang may nullify one target creature within medium range (100 ft. + 10 ft./level) for 1 round (Will negates) as a Charisma-based abjuration effect. For the purpose of this ability, a nullified creature is unable to utilize any function of a spell, spell-like ability, supernatural ability or item that requires casting, concentration, or an activation method other than use-activation.
Powerful Bite (Ex) A fel'fang applies twice its strength bonus to bite damage.
Spellsight (Su) Fel'fangs can see the magical auras of ongoing spells and spell-like abilities within their line of sight out to medium range (100 ft. + 10 ft./level) and freely ascertain the location, identity, function, spell level, caster level and remaining duration of each one. When used to locate the subject of an ongoing effect indirectly, this Charisma-based divination effect does not allow one to overcome any miss chance from concealment that subject may have.