Complexity in Muto based Materials Manipulation

This post is more meta-magic system thoughts for ars magica –  on the complexity in Muto based materials creation and manipulation, raised from a forum discussion…

Switching one form to another should include a degree of flexibility in the final shape, as this is the declared purpose of the spell. As long as the spell is creating a specific object or thing. Surrounding air to a natural plant is fine and declaring the type and shape of the plant is reasonable in the Formulaic formula at base.

Then modifying for complexity in shape seems appropriate, as:

  • I see the complexity as quasi- geometric shapes (+0 mags) like lines, cubes, boxes, or walls. Exploiting a feature of the new material should be free too – like using a plant to create a natural shelter.
  • The allowing sub-shapes in the main shape (1) like windows, basic stairs, spikes.
  • Then almost any other ordinary detail (2).
  • Then finally very ornate details as (3) like artwork.

Having the additional mags should allow forgiveness in the Finesse check but not remove a basic “fit for purpose” check. A serviceable but ugly level for a simple item is vs 6 (a sword), and a more complex item is vs 9 (a suit of armor). Less than this and the finesse check might still be needed (vs 3) , but is really at the “don’t botch” level (a cube of stone).

So a basic sword is +1, and a full suit of armour might be +2. Then add mags for moderate flexibility in choice of form when casting. Making a spell which can pick when cast from a dagger, knife, or sword should cost something, whereas two different styles of swords which are serviceable seems plausible as a spell without too much added complexity. Sword vs axe should definetly need complexity modifiers, if not be allowed at all.

Ref: Atlas Games – Ars Magica forums.

And perhaps interrelated is the Creo vs Muto discussion here, or replacing Finesse with magnitudes of difficulty

Fire to bubbles

Perdo vs Rego for Magic Surpression and Cancellation

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