From ErfWiki

Contents 1 Canon 2 Proposed Canon 2.1 Abilities 2.2 Natural Predictamancy 2.3 Known Predictamancers 3 Speculation 3.1 Predictions that have proven accurate 3.2 Predictamancy and causality 3.2.1 Self Fulfilling Prophecy 3.2.2 Future event created by prediction 3.2.3 Outside influence 3.2.4 Foreknowledge

Canon

Class\Axis	Erf	Fate	Numbers
Hocus Pocus	Findamancy	Predictamancy	Mathamancy

Proposed Canon

Predictamancy is one of the three disciplines of the Magic class Hocus Pocus and composed solely of the element of Life; it is aligned with the axis of Fate.^Erf-b1-p038a

Abilities

• Findamancers and Predictamancers in the Magic Kingdom^Erf-b1-p013 together forged a Spell^Erf-b1-p005 that was supposed to summon the "Perfect Warlord".

Natural Predictamancy

Intuition is said to be a natural form of Predictamancy in LIAB Text 38. Battlespace determinations is said to be Natural Predictamancy in IPTSF Text 27.

Known Predictamancers

• Marie Lavraie: A predictamancer from FAQ responsible for many plot central predictions.
• Delphie Temple of Goodminton, croaked
• Maya Calendar of Haffaton, croaked
• Phillip of the Magick Kingdom

Speculation

Predictions that have proven accurate

• Marie Lavraie predicted that Faq would fall some day.^Erf-b1-p082
• Marie Lavraie determined the order in which cities of Faq were veiled by the Foolamancer.^Erf-b1-p107
• Marie Lavraie predicted that Wanda would take possession of an Arkentool and attune to it.^Erf-b1-p143
• Marie Lavraie predicted that Janis would stack with Parson ^Erf-b2-p67
• Delphie Temple predicted that Wanda would have Olive Branch as her Chief Caster. ^{inner-peace-through-superior-firepower-–-episode-009}
• Delphie Temple predicted that Goodminton would not conquer Haffaton, and that if Wanda continued to talk "she will bring ruin to Goodminton" ^{inner-peace-through-superior-firepower-–-episode-010}

Predictamancy and causality

The mechanisms of predictamancy have not been described in any detail. Some possible mechanics are:

Self Fulfilling Prophecy

Knowledge of the predictions or predictamancy itself causes the predictions to be true. It could be argued that Wanda only became attuned to the Arkenpliers due to a course of actions based on future knowledge.^Erf-b1-p143

Future event created by prediction

Any use of Predictamancy could "plant" an event somewhere in the future of the targeted creature/item/land. For example, when Wanda was affected by Predictamancy, she was "foretold" to attune herself to an Arkentool, but not which one or when. From that point, events that could cause her to attune had a higher odds of occurring, until the prophecy was fulfilled.

Outside influence

Forces beyond the scope of ordinary cause and effect in Erfworld (For instance the Titans) alter events to reach the predicted state regardless of anybody's knowledge or choices. This mechanism seems highly likely given how Wanda has describe Fate as having a specific destination, but different optional paths to get there.

Foreknowledge

The Predictamancer obtains knowledge of future events by some unspecified means. Any actions taken on this knowledge are known in advance as well, and any influence already accounted for. Thus the act of predicting (or more precisely the act of telling someone a prediction) can change events, but the events leading up to the foreknown event are also foreknown.