Still under construction.
The following creatures were made to reflect warlock minions from World of Warcraft.
Fel'fiends such as the fel'spark, umbrawler, fel'fatale, fel'fang, fel'brute, fel'weaver, fel'pyrolith and gloombearer are typically neutral evil outsiders that possess a particular suite of traits (unless otherwise noted in a creature’s entry) as summarized here.
Darkvision 180 feet.
See in Darkness (Su) Fel'fiends can see perfectly in darkness of any kind, even that created by a deeper darkness spell.
Regeneration 1d2–1 (any).
+4 racial bonus on saves against disease and poison.
Damage Reduction 5/magic.
Spell Resistance (Ex) A fel'fiend gains SR equal to its CR + 11.
Immune to ability drain (taken as ability damage), death by massive damage, death effects, energy drain, paralysis, petrification, phantasms, involuntary polymorph effects and sleep effects.
Resistance to acid 5, cold 5, electricity 5, fire 5, negative energy damage 5, psychic energy damage 5, sonic 5.
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.
Racial Bonus Feats: Fel'fiends gain Conceal Scent, Diehard, Endurance and Lurker in Darkness as racial bonus feats.
Racial Modifiers: Fel'fiends gain a +4 racial bonus on Perception and Sense Motive checks.
Telepathy (Su) A fel'fiend can mentally communicate with any other creature within 300 feet that has a language. It is possible to address multiple creatures at once telepathically, although maintaining a telepathic conversation with more than one creature at a time is just as difficult as simultaneously speaking and listening to multiple people at the same time.
Languages: Fel'fiends speak Abyssal, Infernal and at least one other language.
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 Tolerance (Su) Fel'fiends adapt to hostile environments as per adapt body (psionic power).
No Breath (Ex) Fel'fiends do not breathe, and are immune to effects that require breathing (such as inhaled poison). This does not give immunity to cloud or gas attacks that do not require breathing.
Trackless Step (Ex) When desired, fel'fiends leave no trail in natural surroundings and cannot be tracked.