One of the players in the saga I'm running has the Magic Addiction Flaw, and wants to enchant an item with am effect to boost the Concentration roll he has to make to stop casting spells. We looked around the guidelines, and decided that magic can't really provide bonuses to abilities per se, but that it often can provide "indirect" bonuses to some uses of abilites, like the Rego Corpus Gift of the Bear's Fortitude spell which provides a +3 bonus to Soak.
In our saga we have approved a Muto Corpus spell called Eyes of the Eagle that gives a similar bonus to good eyesight, based on the same general concept of the Muto Corpus Eyes of the Cat but with a base of 10 for a +2 to rolls involving eyesight and adding an Animal Requisite. So we thought a similar spell could be created for Mentem that gave a small bonus for the specific task of calming down your addiction-fueled obsession long enough to stop casting spells.
But when looking around the Mentem guidelines, we found several candidate for helping someone break out of an "addicted mindset" and stop abusing some substance (magic in this case). The Perdo Mentem level 5 guideline "Quell an emotion in a person" seems like a good candidate, as does the Rego Mentem level 10 guideline "Control an unnatural emotion (for example, cultivate a person’s feelings of bravery where he is usually cowardly)" in the sense of cultivating a calmer emotion that was not natural to him, as in the example. But the Creo Mentem level 10 guideline "Spark a twinge of conscience in an intelligent being’s mind, overriding the temporary obsession of a demon" from Art & Academe page 35 also seems like it could be adapted to override the addiction's obsession, as does the Muto Mentem level 4 guideline "Completely change a person’s emotions" if you think the obsessive mindest is an emotion, or the Rego Mentem level 4 guideline "Control a target’s mental state (for example, awake, asleep, or confused)" if you think the obsessive mindset is a mental state.
So my question would be, with so many different guidelines that seem like they might apply, but no clear winner, which one do you think would best suit the task?
For easier reference, I've collected below the guidelines I mentioned above:
- Creo Mentem 10 - Spark a twinge of conscience in an intelligent being’s mind, overriding the temporary obsession of a demon (Art & Academe 35)
- Muto Mentem 4 - Completely change a person’s emotions
- Perdo Mentem 5 - Quell an emotion in a person
- Rego Mentem 4 - Control a target’s mental state (for example, awake, asleep, or confused)
- Rego Mentem 10 - Control an unnatural emotion (for example, cultivate a person’s feelings of bravery where he is usually cowardly)