From ErfWiki

Contents 1 Proposed Canon 1.1 Abilities 1.2 Known Predictamancers 1.3 Other 2 Speculation 2.1 Abilities 2.2 Other

Proposed Canon

Predictamancy is one of the three disciplines of the Magic class Hocus Pocus; it is aligned with the axis of Fate.^Erf-b1-p040

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".

Known Predictamancers

• Unknown Caster: formerly in service to Faq.^Erf-b1-p091

Other

Class\Axis	Erf	Fate	Numbers
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Speculation

Abilities

• The Predictamancer of Faq predicted that Faq would fall some day.^Erf-b1-p091
• The Predictamancer of Faq determined the order in which cities of Faq were veiled by the Foolamancer.^Erf-b1-p119
• Wanda taking possession of Arkenpliers and attuning to them was Predicted.^Erf-b1-p156

Other

Since the name of the Predictamancer of Faq is never mentioned and Wanda's functions in Faq are not clear except that she was a caster^Erf-b1-p092, some speculate that Wanda was the Predictamancer of Faq and then changed her Magic discipline to Croakamancy.
Pro:

• Wanda is quite able in other disciplines.^Erf-b1-p013

Contra:

• A caster shown with King Banhammer^Erf-b1-p091 is possibly Wanda wearing the same skull head ornament she would wear later^Erf-b1-p092. It could be her style, but it could also mean that she was a Croakamancer indeed.
• It is never mentioned that casters can move from one Magic discipline to another.