A spell to Burn Down a Castle

This is a quick spell to burn a building down from the inside. In the design I wanted an effect which would allow a pyromancer to immolate parts of a building but not others. Picture a staircase and rooms burning, which directs the panicking inhabitants down the only “safe” passage. Nasty!

It means adding a dual-target adjustment in the spell design, to grant the flexibility and control desired. I thought about creating the spell as Diameter instead, but thematically liked the idea that the magus can at will cancel the effect, and once several rounds have passed the building will continue to burn even though the spell has expired.

Immolation of Harrenhal

Creo Ignem 40, R: Touch, D: Concentration, T: Structure

Heats an entire structure, or a sub-part chosen by the caster, and everything within it to melting point, which creates a devastatingly dangerous environment for the inhabitants and materials. All items including typically non-flammable items will catch fire, and likely continue to burn after the spell expires.

(Base 10 to melt an object, +1 Touch, +1 Concentration, +3 Structure, +1 Part flexibility)

This and over 505 other new spells for Ars Magica can be found here.

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Powerful effects for a Mentem Wizard

Part of designing a high powered Magus for Ars Magica is working out what effects they might have personally developed which separates them from the wizards in the core rulebooks. These two effects use the mind control arts of Rego Mentem to the high level without being a ritual; to command a person utterly, and to issue a command to everyone within a building. The magus who will hopefully design these spells can also use Vim magic to target the spells using Arcane Connections and across battlefields.

Dominion of Thought, Word, and Deed

Rego Mentem 50, R: Eye, D: Moon, T: Individual.

This effect allows the caster to mentally dominates the subject, completely controlling their mind, objectives, and emotions. Complex intertwined motivations, behaviours, and attitudes can be planted in the subjects mind; which they must act upon.

(Base 30, +1 Eye, +3 Moon)

Compelling the Inhabitants Compliance

Rego Mentem 50, R: Touch, D: Sun, T: Structure.

Mentally commands all inhabitants of the target structure to perform a single complex command, regardless of its danger or suitability, which they must carry out to the best of their ability.

(Base 20, +1 Touch, +2 Sun, +3 Structure)

For these and other new Ars Magics spells see the list of spells.