Forgetfulness

Forgetfulness is found on M135. It prevents use of targeted skill, including spell.
A non-usable spell causes a -2 penalty for casting spells for which it is a prerequisite.
Unclear if that applies to Ritual Magery since it ignores prereqs but does calculate penalties based on them.
It may be since they're techniques they can't be targeted (skills only) but that the Path skills could be targeted, wiping out ALL techniques for it.
==See also==
*Retention for Wild Talent: it experiences a similar -2 penalty when initially buying a skill, but uses a -4 penalty for using a skill with a missing prereq.
**note: while Retention prohibits improving a skill until all prereqs are obtained, Forgetfulness doesn't mention that, so it might be possible for a wizard to continue improving a spell to counterbalance the penalty.
***It's probably cheaper to spend 1 point re-learning the prereq, but it's not clear if that is legal/possible as a result of the spell.
****Keep in mind this doesn't just negate points spent on the skill: it CANNOT BE USED period, including basic skills that all characters know at default.
******Even characters with Incompetent or Anti-Talent 4 can still ATTEMPT (at default minus four) those skills, while someone suffering Forgetfulness is completely barred. Which probably means you can't re-learn it until the spell ends. This is basically the 0-point Taboo built into Incompetent and enough levels of Incompetent to make all default uses possible.
==see also==
*Missing Prerequisites
Category:Spells