A quick post to shake out my thoughts of effect level and effect power for spells which modify or cancel other spells. Specifically noting the difference between Perdo and Rego in terms of spells cast by the Magus or anyone’s particular spell in Ars Magica.
For Perdo Vim effects – I’m looking at the The Heathen Witch Reborn (from HoH:S) and Unraveling the Fabric of (form) (from ArM p161) as source examples, and I think they are both using the General spell guideline below. Both effects are at the Level+2 mags + dice, at Range: Voice. That Guideline is at R:Per, D: Mom, T:Ind as normal, then each has altered from the +4 mags to +2 mags to account for the Voice range. Continue reading