The Minor Book Of Forbidden Spells · 12:33pm Feb 17th, 2016

"Fluoridation".
Origin: An attempt to miniaturize the chemical treatment of water in small towns and settlements.
Purpose: Fluoridation of bespelled substance/object.
Efficiency: Fair. A trained unicorn can handle the water sanitation for town up to 5000 population. Past that limit, the amount of water to be processed justifies installation of thaumatomatic water treatment facility. At maximum capacity of 750000 gallons of water, spell takes two and half hours to reach the necessary saturation of fluorine.
Ban reasons: Dangerous to use. If it so happens that spell is cast on a volume of air as opposed to volume of water, fluoridation of oxygen will produce difluoride dioxide - extremely strong and toxic oxidizer. Exposure to FOOF may set on fire materials normally seen as fire-retardant, such as water, sand or stone.

"Spatium" aka "Space Plus"
Origin: Unknown, possibly pre-unification development by Unicorns.
Purpose: Adds space.
Efficiency: Spell serves no reasonable purpose. It`s use introduces more space at the focal point. The definition of "more space" is left intentionally vague due to lack of precise understanding in mechanism of action. The leading theory suggests that spell stretches space-time continuum on the space scale, creating an empty space in the focal point.
Ban reasons: Created space is empty. When used in atmosphere, the resulted space is immediately imploded upon by atmospheric pressure, with destruction of whatever happens to be in/under the focal point.

"Minor Noosphere Disruption"
Origin: Princess Twilight Sparkle`s private research.
Purpose: Controlled release of chaos.
Efficiency: High. Spell recreates the effects of unrestrained Discord exposure in a circular area of roughly twenty spans in radius. Fade may take from six to seventy two hours, depending on length of spell exposure.
Ban reasons: Purpose of spell.

"Laxo"
Origin: Predates written language, multiple possible points of origin.
Purpose: Generic unlocking spell.
Efficiency: Low. While spell can handle deadlocks and bolts, most locks are too complex to be popped open by the spell, lest their construction is shoddy enough to literally fall apart at the nudge.
Ban reasons: Same spell could be used as stunner, if cast upon living target. Unfortunately, simplistic nature of spell causes indiscriminate muscle relaxation - a hit in the barrel can turn lethal if spell affects heart. Coupled with rather unhygienic results if cast on aft half, spell is considered too primitive to be used as stunner. Use against other living beings is thus automatically considered an aggravated assault.

"Want it, Need it"
Origin: Presumably, Starswirl the Bearded or one of his acolytes.
Purpose: Enchantment. Enchanted object compels observers to desire it`s possession.
Efficiency: High. As recently reaffirmed, benign object like a ragdoll can cause a town-wide riot, if enchanted thus.
Ban reasons: Banned as a part of "Bill against compulsion spells, potions and enchantments".

"Sunslammer"
Origin: Unknown. Possibly, invented by princess Celestia.
Purpose: Grand combat spell.
Efficiency: Immense. Spell captures a sphere of matter the size of a head (roughly) and runs fission/fusion reaction through the captured matter until it becomes a ball of elementary iron, containing the energy freed by the reaction chains. The ball is then propelled in the general direction of an opponent. In essence, this is tantamount to hurling a piece of star - destruction potential of such an explosion is simply off the charts and well beyond any accurate measurement.
Ban reasons: Restricted from use under the "Canterhorn convention" which forbids the use of combat magic with effects on continental scale, among other provisions. Last and only documented use of Sunslammer resulted in what is nowadays known as the Eerie Lake.

"Desert Thirst"
Origin: Unicorn kingdom pre-unification, attributed to baron Blueblood.
Purpose: Affects a feeling of thirst, regardless of actual hydration of target. Only works on living beings.
Efficiency: High within it`s niche use. Any living being who can ingest water in a meaningful way will attempt to do so, regardless of how needed or unneeded that intake may be.
Ban reasons: No reasonable/legal use for the spell, but plenty of malicious potential.

Pyra Pulverem aka Pyroclasm
Origin: Starswirl`s research on dragons.
Purpose: Grand combat spell.
Efficiency: Low to extreme, increasing with range. Spell initiates pyroclastic flow. At the distance of a few spans from caster, the effect is akin to peering into furnace - uncomfortably hot, but little else. As the spell progresses, however, it strips the ground and obstacles on it`s path, forming a cloud of glowing hot dust. At the distance of thirty spans, the cloud is dense and hot enough to severely burn, at fifty and beyond cloud is lethal to most known beings. Maximum range undefined, but limited by caster`s endurance, as spell requires constant maintenance and travels at the speed of roughly twenty five spans a second.
Ban reasons: Restricted from civilian use.

Summon Doge
Origin: Unknown.
Purpose: Indeterminate.
Efficiency: Reliably bizarre. Summons dog-like creature that comments on it`s surroundings and circumstances using short sentences. Language indeterminate - any Doge observer hears words in their preferred medium of communication. Sentence structure is invariably abrupt, incomplete and grammatically incorrect, yet contextually sound. Words are commonly combined in unusual and disturbing ways. Paradoxically, the more attention the observer pays to what Doge says, the less sense it makes. Doge itself is of mediocre intelligence and does not seem to possess any readily accessible wisdom or perception capacity beyond that of normal senses like seeing, hearing and smelling. Physically Doge is unremarkable, possessing capabilities comparable to that of a medium-sized dog. Magically, Doge is inert, although it`s possible to enchant Doge intentionally.
Ban reasons: Doge does not furnish anything constructive a regular dog isn`t capable of, but listening to Doge for prolonged periods of time have had been shown to be invariably detrimental to one`s sanity. It is theorized that attempting to adopt Doge as a pet permanently will drive the adopter irrevocably insane in short order.

Coprolalia
Origin: Manehattan Mental Health University R%D
Purpose: Temporary inducement of specific mental disorder.
Efficiency: Coprolalia spell have had been accidentally developed as an offshoot of spell suite designed to treat Turret`s Syndrome. It shares it`s name with disorder commonly manifesting itself in syndrom sufferers - disorder causes the pony in question to constantly swear, berate and otherwise make use of invective lexic. It does not preclude or prevent speaking, per ce, but will cause the speech to be interspersed with occasional vulgarity unrelated to the topic. Spell imitates the effects of disorder, forcing bewitched pony to swear compulsively for the duration of several hours.
Ban reasons: There is no practical reason (besides arcanopsychiatric research) for anypony to compel another pony into vulgarity. The strength of compulsion is more then sufficient to turn an afflicted pony into public nuisance all by themselves, therefore making the casting of spell fall under the definition of "minor magical assault", a felony punished by one to three months of civic labor.