Reduced Might Stripping, a House Rule for Ars Magica supernatural opponents


A great house rule to limit the impact of might stripping spell effects on supernatural creatures in Ars Magica – Multiple applications of Perdo Vim do not stack, specifically for reducing a creatures Might or affecting an Arcane Connection. Once damaged only a more powerful spell will inflict more damage. Makes the famailiars tougher too.

Found via a discord group I’ve been chatting to. Clever idea!


An Avalanche spell from Disney’s Mulan

Another snow based new spell for Ars Magica, for a snow, ice and winter magus which is now languishing in a pbp game which never took off.


Creo Aquam 30, R: Sight, D: Diameter, T: Individual

A massive drift of snow is created a spot designated by the caster, as a circular pile roughly 500 feet wide and 200 feet at it’s highest.

(Base 3 to create snow, +3 Sight, +1 Diameter, +3 Size)

Adminitedly it is a spell with very limited usage, inspired from the avalanche scene in Disney’s Mulan (my kids are big fans).

This spell is part of the free new spells compendium for Ars Magica.

Mulan avalanche image - Copyright Disney

A tricky MR question for ArM

I saw a tricky Magic Resistance question for ArM today, and I find it a frustrating demonstration of the MR rules, and a potentially exploitable rule.

RacconMask wrote – How does this react with Target:Part? If I take (for example) a javelin or spear, and cast a Target: part spell to control the butt of the spear’s haft to attack flawlessly with Rego… does that get magic resistance when the un-controlled tip stabs in? Thinking here of an ‘invisible swordsman’ ReFo spell that only controls the hilt of a weapon.

Grumble. It is a great idea as it demonstrates again how MR in ArM can be complicated. Truthfully it is no different from enchancing a soldier with a spell to increase their toughness, and insisting that they use normal weapons. Which is to say the players at the table need to understand a simple rule – When a rule is exploitable it can be used by everyone, and the GM has far more resources. Do you really want your enemies to react in the same way?

As long as the exploit is applies consistently and it feels congruent in the story, let the players exploit. Then hit them with it.

This is the same for Parma Magica burning spells. They look great on paper, and are exceptionally dangerous, but they also will likley impact the players far more once the NPCs adapt.