Written by the BEWC
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Due to the response I've received by email, I have decided to just go ahead and post our alternate spellcasting rules suitable for use with games like AD&D®. In case you missed the first posting, I am including it also. We've used these rules for over a year, and find that they work quite well. The backfire table was primarily the work of Bob Hall, and is partially derived from the DragonQuest® backfire table.
These rules were developed by myself (Glenn Elliott), Bob Hall, Joe Gregg, Doug Bynum, Brad Gorter, Cliff Chapin, and Kirk Hunt. Kudos to all!
- Glenn ElliottSpellcasters are only required to memorize bonus spells. That means that priests must memorize any additional spells granted by a high WIS, and mages must memorize any additional spells granted for being a specialist mage. In addition, no spell may be cast more than once per day unless each additional casting is memorized. Thus, in order to cast Cure Light Wounds 3 times in one day, you would have to have it memorized twice.
Naturally, you don't get all this flexibility for free. Any time you attempt to cast a spell that is not memorized, you must make an ability check vs the appropriate ability score (INT for mages, WIS for clerics). If you make the check, the spell is cast normally. However, should you fail the check, the spell backfires. The backfire table follows.
We make ability checks using 1d24 because our average ability score is around 14-15. If your campaign has similar characters, I would advise you to also use 1d24. 1d24 can be simulated by rolling 1d12 and 1d6. If the d6 result is 4-6, add 12 to the 1d12 result. Otherwise, read the 1d12 normally.
Use the tables below to determine the backfire result of a Wizard or Clerical spell that is miscast by the caster.
The DM rolls percentile dice to find the result: [The odds have been modified slightly from the original table to improve the odds of an "interesting" result. -Bob]
| 01-03 | With a loud pop and a small puff of smoke, the spell completely fizzles. The material component, if any, is also lost. |
| 04-07 | The spell operates normally, but some aspect of the spell is completely altered in a non-critical manner. Fireballs explode in green flames, magic mouths speak with a lisp, webs appear infested with spiders, and so on. |
| 08-10 | The spell appears to operate in a normal fashion, but the results are actually illusionary. Information spells give misleading or incorrect information. Offensive spells appear to damage the opponent, but sputter and fail. Defensive spells seem to protect the target, but leave him open to an attack. |
| 12-14 | The caster believes the spell has operated in the normal manner. However, the duration of the spell has been altered by some random amount. To determine the modification to the duration, consult table 2 below. Spells with no duration are cast normally. |
| 15-18 | The spell goes off normally, but the range is altered by some random amount. Spells targeted against a specific creature or object will automatically fail on this result. If the range is touch, or it only works on the caster, then the spell operates normally. For area spells, consult table 3 below and apply the result. |
| 19-22 | A weaker version of the spell is cast. The area of effect is scaled down by 20-80%. Roll two four-sided dice to determine the reductions in 10% increments. |
| 23-25 | The spell seems to sputter and fail. However, the actual effects of the spell are only delayed. See table 4 below to find the actual spell delay. If the spell requires concentration to operate, then it will fail to activate. |
| 26-29 | Saving throws made against the spell effects are adjusted by some random modifier. To determine the actual modifier, see table 5 below. If the spell does not allow a saving throw, then a minimal saving throw is allowed. This is usually the highest possible roll on the dice. If the modifier makes this roll impossible, then no saving throw is allowed. |
| 30-33 | The spell is successfully cast, but at a different experience level than the caster. To find the change in the spell casters level, consult table 6 below. If the modified level of the spell casting is below the minimum required to cast the spell, it still goes off at the lower level. |
| 34-35 | All random effects of the spell function at their minimum amount. This has no effect on saving throws made against the spell effects. |
| 36-37 | All random effects of the spell function at their maximum amount. This has no effect on saving throws made against the spell effects. |
| 38-39 | The spell strikes a random target or targets within range. Spells that require touch to operate, or only effect the spell caster, will fail completely. |
| 40-41 | The benefits or penalties normally provided by this spell are reversed. Any beneficial modifiers change to penalties, and any penalties become benefits. If the spell is reversible, then the reverse form of the spell is used. Spells that normally cause damage actually heal the targets. Items that would have been repaired are further shattered. Information spells give exactly the opposite information. |
| 42 | The spell reflects back on the spell caster. Area effect spells are limited to a 10' cube centered on the caster. Spells that only effect the caster operate normally. |
| 43-44 | A random spell is cast by the spell caster. The spell must be understood by the mage, and must be the same level as the original spell. The target or area of effect are determined randomly by the DM. Only the original spell is lost by this effect. |
| 45-46 | The magic user not only manages to bungle the original spell, but forgets another spell in the process. The spell is selected at random from the remaining memorized spells. Both spells are lost until the caster has had sufficient time to rest and recover the spells. |
| 47 | The spell not only fails to function, but the spell caster loses all ability to cast spells within the same school. This ability is restored only after the spell caster has rested for 8 hours. |
| 48 | The spell caster is completely unable to communicate with the rest of the world for 1d4 hours. All writing appears jumbled, conversation becomes jiberish, and hand gestures are incomprehensible. Some spells make alleviate this condition, such as Tongues, Comprehend Languages, and so on. |
| 49 | The spell caster suffers from temporary amnesia. For 1d6 hours, he is unable to remember who he is, what he is doing here, who the people are around him, and so on. He is highly susceptible to suggestions from those around him. Due to the loss of memory, he suffers a temporary -1 penalty to intelligence and wisdom. There is a 25% chance he will permanently forget the previous 24 hours, even after his memory has been restored. |
| 50 | The spell caster loses the use of one of his senses for 1d12 hours. See table 7 for the sense lost, and the resulting effects. There is a 5% chance that the loss will be permanent, if the character fails a saving throw versus Polymorph. |
| 51-53 | The spell caster is stunned for 1d8 rounds. Any creature within 5' of the caster at the time of the miscast must save versus spells or be stunned for 1d4 rounds. |
| 54-55 | The caster is blasted by an energy backlash and suffers a loss of several hit points from magical damage. The number of hit points lost is proportional to the level of the spell. To determine the damage multiple, see table 8. |
| 56 | The caster temporarily loses 1d6 points from a random ability score. The points are recovered at the rate of one per hour. If the ability score is reduced to zero or less, the spell caster falls into a deep coma until the score climbs up to three. There is a 1% chance that one point will be permanently lost from the ability score. |
| 57 | The spell caster is blasted by a powerful backlash of magical energy. His hit points are reduced to zero, and a 4d6 save versus Constitution is required to remain conscious. |
| 58 | The misdirected energy of this spell warps the casters mind. A 4d6 save versus Wisdom is required to remain sane. If the roll is failed, consult table 9 for the form of insanity inflicted on the caster. The temporary insanity lasts for 2d8 weeks. |
| 59 | The spell caster must make a saving throw versus death magic, or he is instantly slain as his head explodes! |
| 60-75 | Something very strange happens. Roll on table 10 to find the whimsical result. |
| 76-95 | Homonymic Malapropism. See table 11 for the result. |
| 96-00 | Repeat this roll and make an additional roll on this table, applying both results. If one of the results negates the spell, then the spell fails to function. |
Roll a ten-sided dice to find the result:
| 1 | The spell functions for 1 round. |
| 2 | The spell functions for 1d4 rounds. |
| 3-4 | The spell lasts for a random fraction of the total duration. Use the smallest dice size that contains the duration. If the roll is greater than the total, roll again until the number is at or below the normal duration. |
| 5-6 | The duration is increased by the equivalent of 1d6 levels. Find the spell duration increment per level of experience. Roll a six-sided dice and multiply the result by the duration increment. Add to the initial duration to get the result. |
| 7-8 | The duration is decreased by the equivalent of 1d6 levels. Find the spell duration increment per level of experience. Roll a six-sided dice and multiply the result by the duration increment. Subtract the result from the initial duration to get the result. If the new duration is negative, the spell fails to activate. |
| 9 | The duration is increased by a random factor. Roll 2-5 and multiply the result by the current duration. |
| 0 | There is a 1 in 6 chance the spell will fail each round. The spell will always expire at the end of the normal duration. |
Roll a ten-sided dice to find the result:
| 1-3 | The spell goes off at a random fraction of the total range. Divide the range by a convenient fraction, such as 5' or 10'. Use the smallest dice size that contains the number of fractions. If the roll is greater that the total range, roll again until the number is within range. |
| 4-5 | The range is increased by the equivalent of 1d6 levels. Find the spell range increment per level of experience. Roll a six-sided dice and multiply the result by the range increment. Add to the initial range to get the result. |
| 6-7 | The range is decreased by the equivalent of 1d6 levels. Find the spell range increment per level of experience. Roll a six-sided dice and multiply the result by the range increment. Subtract the result from the initial range to get the result. If the new range is negative, the spell goes off in the opposite direction! |
| 8 | The spell has the same range as before, but the target is located in a random direction. Roll an eight-sided dice to determine the new compass direction. (1d8: 1=North, 2=NE, 3=East, 4=SE, 5=South, 6=SW, 7=West, 8=NW.) |
| 9-0 | The spell is activated close to the original target, but is scattered 10-60' in a random direction. Roll an eight-sided dice to determine the scattering direction, then roll a six-sided dice to find the offset distance in 10' intervals. |
Roll a twenty-sided dice to find the result:
| 1-5 | 1d10 segments |
| 6-10 | Single round |
| 11-14 | 1d4 rounds |
| 15-17 | 2d4 rounds |
| 18-19 | 1d6 turns |
| 20 | 1d12 hours |
| 1-2 | Allow two attempts to save |
| 3-4 | Add 3 to the dice roll |
| 5-7 | Add 2 to the dice roll |
| 8-10 | Add 1 to the dice roll |
| 11-13 | Subtract 1 from the dice roll |
| 14-16 | Subtract 2 from the dice roll |
| 17-18 | Subtract 3 from the dice roll |
| 19 | Use percentile dice to save |
| 20 | 1% chance to save |
Roll a twenty-sided dice to find the result:
| 1-4 | Half the casters current level (fractions dropped) |
| 5-6 | Subtract 2d4 levels |
| 7-9 | Subtract 1d4 levels |
| 10-13 | Subtract one level |
| 14-16 | Add one level |
| 17-18 | Add 1d4 levels |
| 19-20 | Double the casters level |
Roll a six-sided dice to find the result:
| 1 | The caster is blind in both eyes. See the reverse of the Cure Blindness spell (PHB) for the effects. |
| 2 | The caster suffers complete loss of hearing. See the reverse of the Cure Deafness (PHB) spell for the effects. |
| 3 | The caster loses his olfactory sense. Saving throws against ingested or inhaled poisons suffer a cumulative -2 penalty. |
| 4 | The caster loses his sense of taste. Saving throws made against ingested poisons suffer a cumulative -4 penalty. |
| 5 | The caster loses his tactile sense. Spells requiring a Somatic component have a 10% chance of being miscast, even if memorized. Non-memorized spells must add 2 to the ability check. Saving throws against heat or cold effects receive a -4 penalty. Dexterity is temporarily reduced by 2. |
| 6 | Roll twice on this table, ignoring this result hereafter. |
Roll a twenty-sided die to determine hit points of damage caused by the backfire:
| 1-7 | 1hp/spell level |
| 8-13 | 2hp/spell level |
| 14-17 | 3hp/spell level |
| 18-19 | 4hp/spell level |
| 20 | 5hp/spell level |
Roll percentile dice to find the result:
| 1-6 | Dipsomania |
| 7-12 | Kleptomania |
| 13-18 | Schizoid |
| 19-24 | Pathological Liar |
| 25-30 | Obsessed compulsive |
| 31-36 | Split personality |
| 37-42 | Melancholia |
| 43-48 | Megalomania |
| 49-54 | Lunacy |
| 55-59 | Paranoia |
| 60-65 | Manic-depressive |
| 66-71 | Hallucinatory insanity |
| 72-77 | Sado-masochism |
| 78-83 | Homicidal mania |
| 84-89 | Hebephrenia |
| 90-95 | Suicidal mania |
| 96-00 | Catatonic |
Roll percentile dice to find the result:
| 01-02 | The spell caster develops a rash that lasts 1d4 weeks. Spell recovery time is doubled due to lack of sleep. |
| 03-05 | The caster suffers from an excessive emission of flatulence for 1d4 hours. His charisma is temporarily lowered by 3. |
| 06-08 | The eyes of the caster begin to glow like flashlight beams. The light illuminates up to a range of 15', but is visible from a much greater distance. The duration of the light is one day. |
| 09-10 | Wisps of warm steam emerge from the casters bodily orifices. This eruption lasts for one full turn. |
| 11-13 | The hands of the spell caster begin to glow a warm orange color. Everything the caster touches is left with glowing finger prints. The glow fades after 1d12 turns. |
| 14-15 | The caster believes that a huge blue hamster has materialized, dressed in formal wear and speaking common. The hamster follows the caster for one hour. |
| 16-18 | Dark green leaves erupt from pores all over the casters body. The noisy leaves turn brown and fall off after a day. |
| 19-20 | The caster is overcome by a sudden wave of intense heat which lasts for 1d4 rounds. He strips off all clothing and drinks any available beverages (including not more than one potion), unless they are known to be poison. |
| 21-22 | The caster feels an overwhelming urge to sing. His life story becomes a one hour ballad. NPC reactions will depend on the singing ability of the caster. |
| 23-24 | A stream of 5000 moths spew forth from the spell casters mouth and flutter around for 1d4 rounds. Vision is limited to 1' within a 20' radius sphere centered on the caster. |
| 25-27 | Any buttons, clasps, buckles, latches, padlocks, pins, laces, bars, knots, or other locking devices within 10' of the caster are unlocked. All creatures within the area of effect are allowed a saving throw versus magic to prevent their possessions from becoming undone. |
| 28-30 | The hair and fingernails of a random target within 20' of the caster begin to grow at a prodigious rate. Hair grows down over the eyes, reducing the To Hit score by -2. Long finger nails make delicate finger work impossible. Growth stops after a round. |
| 31-32 | Each round, for a number of rounds equal to the level of the caster, a randomly selected creature within 50' must save versus spells or be teleported to the location of the caster. Simultaneously, the spell caster is teleported to the former location of the selected creature. No teleportation occurs in a round in which a saving throw is made. |
| 33-34 | If the caster fails a saving throw versus polymorph, his head is polymorphed to that of an animal randomly selected from the bag of tricks magic item table (DMG). |
| 35-37 | Everyone within 15' of the spell caster must make a saving throw versus spells, or suffer from a loud ringing sound in their ears. The ringing is actually a physiological effect, and not an actual sound. Characters must shout to be heard, and no listening attempts are possible. The ringing lasts for 1d6 turns. |
| 38-39 | A tiny portal, no bigger than a pin prick, appears about a yard above the spell caster. This portal is linked to the elemental plane of water, and a steady drip of water falls on the casters head. The portal is magically linked to the caster and follows him around. Attempts to plug the gate will always fail when the caster moves. The constant drip of water makes deep sleep nearly impossible. Double the normal spell recovery times. The portal remains for 2d10 days. |
| 40-41 | The air within 60' of the spell caster takes on a glass-like appearance, which distorts normal and infra-vision. Judging range within the area of effect is difficult, effectively doubling all spell and missile travel distances for purposes of range modifiers. There is no effect on movement or melee within the distorted air. The radius shrinks 10' per turn until it finally vanishes. |
| 42-44 | The spell summons a small local animal. The creatures arrives in 1d4 hours, and becomes extremely attached to the spell caster. It will climb all over the character, reducing THAC0 by 2 and Dexterity by 3. The animal has 1d4 hit points, plus one per spell level. If the animal is damaged, the caster suffers damage equal to double the animal's hit point loss. Once a week, the caster can attempt a saving throw versus spells in order to release the animal from the spell effects. |
| 45-46 | For 1d4 hours, plus one per spell level, the voice of the spell caster will start with a loud rumble of thunder each time he or she begins to speak. This will increase the odds of encountering wandering monsters. |
| 47-48 | The casters voice emanates from another party member, and sounds like that individual. The source changes once per round, lasting one round per spell level. |
| 49-51 | The spell caster becomes insatiably hungry each time food is mentioned. This effect lasts for one day per level of the spell. The caster will demand and consume triple the normal quantity of rations. Each ration below the required quantity will cost the spell caster 1d4hp per day. |
| 52-53 | For 2d8 rounds, the spell caster finds himself on display inside a glass container. Huge beings with distorted features examine you from the outside, turning the container around and over. The caster feels insecure for days afterward. |
| 54-56 | All the spell casters clothing and other items completely disappear. The caster is naked, save for any items carried in his hands. The possessions reappear in a pile at the casters feet after one round per level of the spell. |
| 57-59 | The legs of a random target within 15' of the spell caster contract to 1/3 their normal length. All leg coverings and foot wear shrink by a like amount. Movement is reduced by 2/3rds. After 1d6 rounds, the legs and garb return to normal. |
| 60-61 | A random target within 30' of the direction the caster is facing is infested with thousands of small insect pests. Armor Class and To Hit rolls are penalized by -1 due to bites and stings. |
| 62-64 | The legs of a random target within 25' are paralyzed for 1 round for every two levels of the spell. Movement is halved for animals and monsters. Humanoids can crawl at 1/3 the normal movement rate. |
| 65-67 | The caster is summoned to clean up a mess for a local power. He or she disappears for 2d8 rounds, loses 1d6 hit points plus one per level of the spell, and has a 50% chance to cast a random spell. Hit point loss will not cause death. |
| 68-69 | 2d6 bolts of energy fly from the casters hands and strike random targets within 40'. Each does 1 hit point of damage per level of the spell. |
| 70-72 | The caster falls into a magical sleep for 1d4 rounds plus one per level of the spell. Unless disturbed, the caster will remain in a deep and restful sleep. While left asleep, spell recovery rate is doubled. |
| 73-75 | Lumps of slimy pink lard splatter to the ground in the area of effect. If there is no area of effect, the lard falls in a 5' radius around the target. Movement through the lard must be 1/3 normal, or a saving throw versus paralyzation is required to remain standing. The lard remains in place for one turn. |
| 76-78 | The spell caster becomes a garbage magnet for all sorts of debris. Any loose paper, leaves, plaster, small stones, feathers, dirt and other small objects within 20' fly up and stick to the unfortunate spell caster. This continues for 1 turn per level of the spell. It requires 1d4 segments to remove any new debris from the face and hands. |
| 79-80 | The malodorous caster emits a pungent scent of onions within a 10' radius. Anyone smelling the onions must make a saving throw versus poison, or begin to suffer from blinking and watering eyes. The resulting blurred vision reduces any To Hit rolls by 2, and halves the normal range of sight. The odor lasts for one hour, or until the caster bathes in water. |
| 81-00 | Roll on the Wild Surge Results table on page 7 of the Tome of Magic, or use Table 11 (Homonymic Malapropisms). |
To properly execute this result, the DM will have to create a "new" spell that has a name that sounds similar to the intended spell. The "new" spell usually does not really do much of anything, but it should provide amusement. Unless otherwise specified, the duration of the "new" spell matches the normal spell. Here are some samples, in alphabetical order by "original" spell name.