Whereas the magics of the Arcane involves the manipulation of energies found beyond the world, Fel is the magic found in the blood of demons. As demons consume the energies of the worlds they conquer, those energies are absorbed by the demons' blood giving a magical "high" greater than that of Arcane magic. By siphoning the Fel magics from demons, the user can gain demonic abilities and enhance their own magical powers. Consuming demon blood gives a greater infusion of Fel energy as indicated by the Fel orcs' pact with the demon Mannoroth. Fel energy is more chaotic than Arcane and slowly corrupts the user into a state of decay.
Grammar and Usage
A prefix associated with demonology, or more specifically, the Burning Legion. The word itself has no singular meaning (that has been explained at least), but is usually affixed to other words to denote their corruptive nature or connection to demonology.
The game refers at least once to Fel in singular meaning. An Undercity quest A Sample of Slime... has in its description sentence "There, slimes are found all around pools of water blessed by the touch of Fel.", so there may in fact be singular meaning.
A second reference to Fel in singular form is found in the quest Felbound Ancients in which it is said "The satyrs have been able to corrupt anything they come in contact with, which includes the ancients that made Felwood their home. By the use of the fel, the spirit of the ancient has been bound and tortured, never completely released. The felbind you found is no doubt related." Furthermore, Eridan Bluewind in the Emerald Sanctuary states "... Although the land is named for the very thing that corrupted it..." These references would seem to suggest that fel is indeed some substance, force, or energy. Though perhaps it could also refer to a technique or the corrupting influence of the Burning Legion.
Warlocks
Having an innate association with demonology, Warlocks have adopted a connection to the darkest fel energies. Through their understandings of demonology they are able to dominate certain agents of the Burning Legion, such as voidwalkers, succubi, and felhunters, and through their enslave demon ability, doomguards and infernals as well.
Language
In Hebrew, the word "אפל" (Afel) means "dark" or "tainted". The now-archaic English adjective "fell" means "cruel" or "savage". The word "fel" can also mean "bile", and according to The American Heritage® Dictionary of the English Language: Fourth Edition (2000), it is related to a number of words of Indo-European origin: yellow, gold, gall, cholera, and felon, to mention a few. The same source indicates that the Indo-European root from which it is derived, ghel, meant "to shine."
Examples
- Felwood: The formerly beautiful forest adjacent to Ashenvale that has since been corrupted by demons and made into a tainted cesspool.
- Fel Orcs: The derivative of the Orc race that resulted from their blood pact with the Burning Legion and their consumption of the blood of Mannoroth.
- Felguard: The basic foot soldiers of the Legion.
- Felhound: Guardians and pets of the pit lords of the Burning Legion, used to sniff out sources of magic.
- Felsteed: A demonic mount available for summoning by Warlocks.
[Felcloth]: A tainted fabric woven by demonic energies which can be purified by tailors to create 
[Mooncloth]. It drops off demons.- Felheart Raiment: A Warlock armor set.
- Felboar
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