
Well, do remember that those threads are in many ways speculative.
I think it's still entirely viable to have a person whose ineptitude with magic manifests as spells often having reverse effects, though again with the proviso that no such exemplars exist within the lore. That doesn't mean you can't do it, it just means that, well, it'd be a Thing about your character, and you don't really want too many Things, as that stretches credulity.
EDIT: Said ineptitude would have to be explained. Since Conjury is based on calling upon Aether outside yourself (specifically, that of the elements), it's possible for external forces to interfere. Thaumaturgy and Arcana are based on internal Aether and failures like this would have to be a personal fault -- anything from exceedingly poor handwriting or dyslexia for an Arcanist to failings of will for a Thaumaturge. Of course, these internal factors can apply to Conjury as well. That said, to cast a spell that is properly trained and have it have a reverse effect due to internal factors would mean your character would be an egregiously poor spellcaster from a technical standpoint.

EDIT: Said ineptitude would have to be explained. Since Conjury is based on calling upon Aether outside yourself (specifically, that of the elements), it's possible for external forces to interfere. Thaumaturgy and Arcana are based on internal Aether and failures like this would have to be a personal fault -- anything from exceedingly poor handwriting or dyslexia for an Arcanist to failings of will for a Thaumaturge. Of course, these internal factors can apply to Conjury as well. That said, to cast a spell that is properly trained and have it have a reverse effect due to internal factors would mean your character would be an egregiously poor spellcaster from a technical standpoint.

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Quality RP at low, low prices!
((about me | about L'yhta Mahre | L'yhta's desk | about Mysterium, the Ivory Tower: a heavy RP society of mages))